Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ab97febe5516e8b…

MALICIOUS

PDF

77.0 KB Created: 2021-06-06 04:37:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 20edb2679b7f5540e95753750acc9867 SHA-1: 3e47727d8728ffbea4f5ff7de9b256c5d66f5e7a SHA-256: 3ab97febe5516e8bc567f862e0ed3a8a7187b296e0c3abd01836711e0523c54c
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a phishing or content-scraping lure, likely intended to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://inwebjor.ru/pbw?utm_term=parallel+and+perpendicular+slopes+and+equations+of+lines+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462976/normal_604ad184b0890.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375207/normal_6002635684151.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387920/normal_5ffc58c1ef53a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453719/normal_5fd66205bfb76.pdfIn PDF document text
    • https://kiwotatuna.weebly.com/uploads/1/3/1/8/131856308/cd7e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479222/normal_60661eda3c68a.pdfIn PDF document text
    • https://xeninudi.weebly.com/uploads/1/3/3/9/133997188/6648700.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425009/normal_5fdcca5e29044.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4374185/normal_60b3212678fec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427079/normal_5ff22fb033b6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379984/normal_6061f5841d380.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366041/normal_602a7d4a99ea2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496165/normal_5fd2d72b67984.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491687/normal_605ee80ccfa83.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wurogakitibe.pbworks.com/w/file/fetch/144645270/62157753338.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb10f00f-b206-4b97-80b3-97e5b1a20295/posicion_relativa_de_dos_rectas_ejercicios_resueltos_4_eso.pdfIn PDF document text
    • http://popuwepux.pbworks.com/f/how_to_make_wing_chun_dummy.pdfIn PDF document text
    • http://vazexetuv.pbworks.com/f/how_to_factory_reset_hp_smart_tank_515.pdfIn PDF document text
    • http://jobagej.pbworks.com/w/file/fetch/144668994/interview_questions_and_answers_for_mis_executive_in_excel.pdfIn PDF document text
    • http://tezalef.pbworks.com/f/computer_organization_and_architecture_online_course.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a32e014-1178-4512-a159-a85824d8e3bd/34730692345.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ed414b9-e6fe-4355-99e5-d9b96c63837c/download_bts_bon_voyage_season_4_episode_2_sub_indo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/809bc504-629f-497a-b6c5-ab87030e13a4/pogip.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_off0000e9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AC 5528 bytes
SHA-256: 2d4177abeac1bfc74a76a2499dd6af1dcc10f50489936307f85f90de1b36708b
font_01_sfnt_off0000fc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC82 11424 bytes
SHA-256: 2d37bccf98a242bfc6b61a4141c039eeb1bfa7520b2d974fb2bb6a8cf8420a31