Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d571b686e09995b…

MALICIOUS

PDF

73.4 KB Created: 2021-03-27 22:44:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: aa24b68cfe9bb322f8b1b8768ec3195a SHA-1: 84dc0a072dacd18404de052b4dab95c61904e273 SHA-256: 6d571b686e09995b6ffec85b88c025cb05a4013697731d59ab730da7de8dbe9d
246 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. It uses brand-impersonation credential phishing. 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 0.9998

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://vonewujin.weebly.com/uploads/1/3/1/3/131380349/7888638.pdf.
  • 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://dafemum.ru/wix?keyword=difference+and+sum+of+cubes+worksheet PDF link annotation
    • http://logoped-samara.ru/61367936120d6pvn.pdfIn PDF document text
    • http://premiumpornclips.com/pudenafurotavanutalidaxiv9b6g.pdfIn PDF document text
    • https://vonewujin.weebly.com/uploads/1/3/1/3/131380349/7888638.pdfIn PDF document text
    • http://sneakerspapa.store/chartered_financial_analyst_institute_in_mumbaij9m4t.pdfIn PDF document text
    • https://rexirarilabe.weebly.com/uploads/1/3/2/6/132681411/fasapefuvoga.pdfIn PDF document text
    • http://apsdd54gfv.xyz/ps_store_cyber_monday_2019wpb9j.pdfIn PDF document text
    • https://cdn.sqhk.co/loberutebe/c4xhahi/table_tennis_games_for_pc_free.pdfIn PDF document text
    • http://it50off.pro/29000598631xjdck.pdfIn PDF document text
    • http://alex-travel.moscow/push_maze_puzzle_level_362jjjm0.pdfIn PDF document text
    • https://cdn.sqhk.co/minofavazu/bkijAI9/31587289384.pdfIn PDF document text
    • http://jewlgems.com/67940743259e825f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_f40c0c00cd824c82a85a1282c14535fd.pdf?index=trueIn PDF document text
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_2976688849ac47118f82db88a9086009.pdf?index=trueIn PDF document text
    • http://robirevi.epizy.com/zemebabiv.pdfIn PDF document text
    • https://9fb0fece-6c2a-4f8b-8ff1-5d9ea67f5ee7.filesusr.com/ugd/f6a907_fab1a391c94b4e07b4b26740a5cfdc02.pdf?index=trueIn PDF document text
    • http://jafojib.rf.gd/bokubiriwutixa.pdfIn PDF document text
    • https://ec08fec6-e576-400d-8504-372613838d3c.filesusr.com/ugd/57e0ce_b62b522577bf45d5abaff8448a52d289.pdf?index=trueIn PDF document text
    • http://vejikavufabaj.epizy.com/histological_types_of_breast_cancer.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE417 5524 bytes
SHA-256: a722115b1a068a4962eab56624343740f9c2f72a3fff1396e5e066b534557aae
font_01_sfnt_off0000f6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D0 9960 bytes
SHA-256: bfe6c4671aeb5490dfe4b885873ad45ca3d588d540f6a1fd5bab1774c9d62c90

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