Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b32e96e0a7de52c…

MALICIOUS

PDF

118.1 KB Created: 2021-04-09 17:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 94c1de144b3f38a975ea88f6a0b4bbd1 SHA-1: 5af0c6b9776c6e6d68fded58afda3596023dc304 SHA-256: 4b32e96e0a7de52c443b44976788fa37b883cd3d18c4aa6014f062697f890ee0
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/strik?utm_term=left+unattended+synonym In PDF document text
    • http://yyyyyyhhhhh.space/fake_love_piano_sheet_music_easyma3dc.pdfIn PDF document text
    • https://najijufo.weebly.com/uploads/1/3/4/7/134714833/711b7670.pdfIn PDF document text
    • http://slimerecipe.org/bhoot_ki_photo_wallpaperirl54.pdfIn PDF document text
    • https://togutugu.weebly.com/uploads/1/3/4/6/134617883/puzakeniwitin-lamoxi-bewugawij-lonubotuz.pdfIn PDF document text
    • http://studyweb.site/pomovuwewagutazov0p2z.pdfIn PDF document text
    • http://iclod.tech/asvab_book_freetr7pu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_b37b625d1a14402fb1b291b4d468dcaf.pdf?index=trueIn PDF document text
    • http://lumawasisoxo.rf.gd/calendario_rusia_2020_descargar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a7d8b0f-3392-4336-81c6-ccaeee8a6af2/craftsman_shop_vac_model_cmxevbcpc1650_manual.pdfIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_ab6b09a81a9042d6891aead004413d32.pdf?index=trueIn PDF document text
    • https://d6236f05-450e-4b96-9875-1783d83c708b.filesusr.com/ugd/912de2_a9bd4d6fc24a4cd9a1da456c78f3b249.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/df33d95a-e458-4096-8d9b-7fb8b63d9c30/how_to_record_on_a_polaroid_is048.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1abe4150-acf6-4f60-b706-cc35735dff71/kenmore_80_series_gas_dryer_heating_element.pdfIn PDF document text
    • http://kejarajavamoge.epizy.com/puwodixapokok.pdfIn PDF document text
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_b36c6ca10633441c93deb96eee42d152.pdf?index=trueIn PDF document text
    • https://4095172d-bd2f-4181-91d7-dd424e653400.filesusr.com/ugd/df73ab_c66ba3a591aa437c866ed46ddc6e56e5.pdf?index=trueIn PDF document text
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_69600f5e5ee44a4f8b24302ff6f9a134.pdf?index=trueIn PDF document text
    • http://mosiwejajawam.rf.gd/81579185991.pdfIn PDF document text
    • https://aabf49e0-5477-4fd2-8456-a986ef8f2a87.filesusr.com/ugd/9e14ca_3f9ac3b4d91b4abe821cd953278db41e.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00019794.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x19794 21652 bytes
SHA-256: ee0477d94fd0b0e283c5fa1318697aaba8473a173a87e6285ebbe2a18097ee35
font_00_sfnt_off00011bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC2 8052 bytes
SHA-256: a975e0f396a02bb80e1ed09765f3d2b8eb3648d7cd13984ce36c2da695bdd604
font_01_sfnt_off00013760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13760 4968 bytes
SHA-256: 391c59afb16a34fe72ac21615191d0c6506fd8f386124bcae489f4369b205c18
font_02_sfnt_off0001483f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1483F 7772 bytes
SHA-256: 1ba5c9db7b13b2c4d1bca15fcb7933b17127319829cfe32c0b1d9c810a4def5b
font_03_sfnt_off00015dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DBD 19208 bytes
SHA-256: a7e97a2c576c72defbe359f5cec52e70259500e52ee0d3ba9edc842d30483f9e
font_05_sfnt_off0001bc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC48 3420 bytes
SHA-256: 8fff2be978c789669ba5d8319f53f2642d8fd9f3a2071fe414147fe9a3b76b59