Malicious PDF — malware analysis report

Static analysis result for SHA-256 45eaef61de200e84…

MALICIOUS

PDF

80.0 KB Created: 2021-03-10 05:07:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f724bb0352a250ab0a001a07454670c3 SHA-1: 0487a19ec0e497eb2e5eba02b625301e772ed353 SHA-256: 45eaef61de200e84604b663eee3db2433e7c6f4ecf2b82e117e975066d958f34
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 0.9998

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://bologen.ru/aws?utm_term=english+grammar+betty+azar+5th+edition+pdf PDF link annotation
    • https://cdn.sqhk.co/rudolikube/jj1vidQ/music_theory_definition_dynamics.pdfIn PDF document text
    • https://nujuwededewomoj.weebly.com/uploads/1/3/4/3/134305400/bivagamudet_feliralanoran_tolixerowu.pdfIn PDF document text
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/5162232.pdfIn PDF document text
    • https://xujikipige.weebly.com/uploads/1/3/1/3/131379844/kedaku.pdfIn PDF document text
    • https://tajudazu.weebly.com/uploads/1/3/4/3/134328852/5129339.pdfIn PDF document text
    • https://gepadagonuvo.weebly.com/uploads/1/3/0/7/130775626/5761070.pdfIn PDF document text
    • https://pememeva.weebly.com/uploads/1/3/0/8/130874233/2779838.pdfIn PDF document text
    • https://cdn.sqhk.co/puwokiraf/LSl2gge/best_interior_design_blogs_on_instagram.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_c105d8b6ee3745bd9a6c9239e835d25a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/19648084-63ea-4ec4-aeb3-330d900d1c62/51768711221.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a88265a5-b9f9-4863-b024-e4fb2563fe63/talumaniluzuwufijufolubes.pdfIn PDF document text
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_651f759ec90048019f344c7fc3540dab.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/42368b75-28c0-423e-af14-051252da54c4/60876221043.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd818cd3-2211-4b11-be3e-3cd15d6b2924/nigonawevaxujed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fc0408c-41e3-4991-a68b-079e72261e2e/15796211216.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2174982-31e5-47db-abe9-208051158b4e/muscle_workout_at_home_without_equipment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f30dfff-1ddd-4ad8-a575-ed7c45093973/how_to_improve_programming_skills.pdfIn PDF document text
    • https://12c48f50-3553-44c7-a31c-19fc5df83d07.filesusr.com/ugd/7e0eb0_a7d880813f60409495b3cade2ba44407.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d903cfa-cb7a-41f5-b738-ac8f5d984d7a/dave_ramsey_financial_peace_book.pdfIn PDF document text
    • https://7ffe38df-ef78-47a1-8632-a9c579db478a.filesusr.com/ugd/8ff694_9a0bf8dd1d42499497ca243799e0b18a.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF67 5828 bytes
SHA-256: 746cd71c38f4fb0c35ae5a7badbe182675c28e33667f6de1be1244f3789776c0
font_01_sfnt_off00010328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10328 15536 bytes
SHA-256: d5598d3ce2260487a1d74c0309284ed597decdfdb66f146471b1d1a4b6a5a30e