Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ca138da4be102b4…

MALICIOUS

PDF

149.3 KB Created: 2021-03-29 21:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e18d511b362b8e8c3f9a669c1233af42 SHA-1: 5ffb7c8fb5faebbc6b6091a4c34a7cb04310b0c8 SHA-256: 7ca138da4be102b44e74fa988fdd9d619179aa48cf4d439b120a6e8ef278c24b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8630

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/aws?utm_term=shiva+purana-uma+samhita+in+hindi In PDF document text
    • https://zabavorurexezab.weebly.com/uploads/1/3/5/3/135314693/8295953.pdfIn PDF document text
    • https://gegosaso.weebly.com/uploads/1/3/4/0/134040985/disorimeniva.pdfIn PDF document text
    • https://cdn.sqhk.co/ketofebem/AhhBijC/tic_tac_toe_2_player_cool_math.pdfIn PDF document text
    • https://cdn.sqhk.co/monasomeb/BOhcHic/vofigaka.pdfIn PDF document text
    • https://cdn.sqhk.co/pesegozod/jjdhhAN/funny_gift_ideas_for_guy_friends.pdfIn PDF document text
    • https://cdn.sqhk.co/bemoranoz/gQehdSf/74503612291.pdfIn PDF document text
    • https://lanudoda.weebly.com/uploads/1/3/2/3/132303217/wubekosipod_vifonudereju_viguxigawevi_dojulit.pdfIn PDF document text
    • https://cdn.sqhk.co/jogeguzotire/Chbjaja/business_international_degree_jobs.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vonusirukete/brother_in_arms_mod_apk_free.pdfIn PDF document text
    • https://964beff5-d24f-450a-94e2-fa7e9faef44a.filesusr.com/ugd/61158f_2a3b1f8ce70f46f99a1194c04c47320c.pdf?index=trueIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_56d059ec0ebb494ebcacd2f102e7ee17.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/bombay_dyeing_bed_sheet_online_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f62bed30-aa2a-4c60-a6bd-ef21d18a269a/mezelixijenokix.pdfIn PDF document text
    • https://591379ed-26d0-4405-baa7-5b8dadede013.filesusr.com/ugd/866ffa_b228b0db9ba1436d80c519dcec99aacc.pdf?index=trueIn PDF document text
    • https://4fcc26ae-a476-48f2-98aa-cdc5c12f4544.filesusr.com/ugd/32d0e1_7bbdabf6992640228d7b575c7c8ffe22.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/usps_address_format_apartment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b71ebda-d27e-4114-a278-922fa5af3cb7/tuwezemid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a507c22a-0739-4643-b8ea-f3012176fd99/bozelopuboxiditakusozaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f18a3ab-70be-47b7-8b02-081feb085999/32644274021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bbb8bd6-74e4-47b1-9aa7-eb29b6bef679/64234763271.pdfIn PDF document text
    • https://a82c121c-2200-4cd7-aff6-47cf910fdadb.filesusr.com/ugd/117c17_bf611e2b79b8435fb9caa86cc5db6094.pdf?index=trueIn PDF document text
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_1d01d0444cbf4667afaecf70845a521a.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 12

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0001a07d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1A07D 3168 bytes
SHA-256: 30e1b517205f4f9c2831808d421fe9e4e35eea8d6eacbb4932c2ebf55147b6c9
font_00_sfnt_off00015115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15115 6432 bytes
SHA-256: cfcdc03ecb496665ef8b6e706a69a1fb47271609e834789be16dda487b61a66e
font_01_sfnt_off000160c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160C0 3756 bytes
SHA-256: b321c326777262333f1307fcbe0d61dc8ea953c00244fb556420524d652bccaa
font_02_sfnt_off00016e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E2A 5016 bytes
SHA-256: 18bb94b75354fa02888d78d896b719c20de58dd0fd85ec149fd2c063cc6a1884
font_03_sfnt_off00017ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EC0 6364 bytes
SHA-256: 0cc00c6b977859951f3a2d26ba8f43ce9560b5a414d3e83f75ff34f2fce73a82
font_04_sfnt_off00018e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E5A 8996 bytes
SHA-256: 66de4857af9bc76d2371a30ddfc77322038f648f8e9e974166f1cbe93b2150d1
font_06_sfnt_off0001ad52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD52 10144 bytes
SHA-256: d9c092c3fbcd0f888b12e768fa8728a3dfa54e5877134e0668dae2e465fb51ea
font_07_sfnt_off0001c861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C861 16200 bytes
SHA-256: 71f30425cbd2daa53970b91f993aa3f290b61951bfb8e161bedac2d2545a36ee
font_08_sfnt_off0001fc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FC67 17256 bytes
SHA-256: 9a437ac2b3e39878814c1d65489fbc3b9115d41423be8d1632999ea64a30bd18
font_09_sfnt_off000215f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x215F4 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
font_10_sfnt_off000223fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x223FD 4356 bytes
SHA-256: 8e77c8fac586ba77f6afa6581d8e9e2a3f14d27b997956bacac6d5b5dd72c3cb
font_11_sfnt_off00023429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23429 6112 bytes
SHA-256: bcbd7c33d201367d33a95f692e78cce9e5e52c560916e5ea036cc408bb2e069e