Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25d1f0c5bf04202…

MALICIOUS

PDF

109.4 KB Created: 2021-03-31 17:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2039036933e0f7ed6b62125609a5de2b SHA-1: 56a0f641409d5af085b7cab5b4620c0325228e1b SHA-256: a25d1f0c5bf042029054518a1c3e77f03ba736e512fccf83868b516ee14232e3
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://leonvi.ru/wix?keyword=dido+virgil%2527s+aeneid PDF link annotation
    • http://xawamiwupajev.mygamesonline.org/magyarorszg_alaptrvnye_knyv.pdfIn PDF document text
    • http://kirudikegopoded.sportsontheweb.net/for_the_love_of_act_science.pdfIn PDF document text
    • http://kovativegapok.getenjoyment.net/i_pace_max_charging_speed.pdfIn PDF document text
    • http://detonic-shop.website/56174332656duqw5.pdfIn PDF document text
    • https://dijibelusubif.weebly.com/uploads/1/3/4/8/134871127/bavewejupigetoze.pdfIn PDF document text
    • https://maritomumotoko.weebly.com/uploads/1/3/4/5/134512683/be24cc0b0.pdfIn PDF document text
    • https://lefaxujil.weebly.com/uploads/1/3/0/7/130739779/a0d13e65a0d.pdfIn PDF document text
    • https://dorizusedi.weebly.com/uploads/1/3/0/7/130776489/borojal.pdfIn PDF document text
    • http://coolstudent.space/zaninebagupudws23n.pdfIn PDF document text
    • https://noberewesuxo.weebly.com/uploads/1/3/1/3/131379636/2228302.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/51b61747-622e-45d9-8ef5-9e33c03f147e/tudopefadafonuwema.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfb53fb1-6297-446c-b6d6-a4057ddbdb10/79923870315.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f35554ac-de83-4b80-8a1d-b13a247be259/how_to_write_a_poem_mla_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8b170d9-970c-4dd9-a929-37f4aec2b77b/mofafaloxinugow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/320f09f2-869c-45b5-984b-58a524477206/finite_element_method_flow_problem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b61c5ec-baa2-4d2f-9115-34ada3739ce7/79622621868.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d087f7d2-1ea5-4737-8d39-f30dc9c995f7/55025135470.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/087a7403-5d68-4487-b88b-538961c3e669/how_to_add_buttons_in_wix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49b3443b-93cb-48e9-86b9-7577dc38b61f/48342870517.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8dce275-0add-45d8-ba4e-0a4a1dcad7b6/33977638051.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34af9a85-7b1e-4cb3-b0df-8fc88affc718/55370682093.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c5e44c3-fd46-4a91-a3ce-6ba6d0974d0e/bronica_etr_lens_to_canon_eos_adapter.pdfIn 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://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
    • 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5B 5088 bytes
SHA-256: 0334f0e2f3c5184306b7cf5d8449e51a737fbb5d495b30f915505421699a3240
font_01_sfnt_off00014dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DCC 15264 bytes
SHA-256: d547160fd749ce12e93c00f0e9fe99f56089966bb5dba202a7dbc0acb9933701
font_02_sfnt_off00017cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CD4 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7
font_03_sfnt_off0001916a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1916A 8020 bytes
SHA-256: fe69684831fe18b24aa1bc38c036bbd575c736d1cd6fac17a545f91cdfd5c4d8