Malicious PDF — malware analysis report

Static analysis result for SHA-256 869079c9953fcec6…

MALICIOUS

PDF

80.6 KB Created: 2021-03-01 11:02:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c22191a83f962ef71b73848bc3cccdf3 SHA-1: 29af1ebcb51ac7ed26216e5cb8953f07e14d156f SHA-256: 869079c9953fcec621f92d4e2ac4492887eee3a8fc3f262b50f78051e9aa9628
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/123?utm_term=tyt+th-9800+frequency+mod PDF link annotation
    • https://feraresafobigim.weebly.com/uploads/1/3/0/8/130813798/cd063c1.pdfIn PDF document text
    • http://reactivaperu-2020.com/turbat_balochistan_weather_reportzjkw0.pdfIn PDF document text
    • https://nifusesoporiw.weebly.com/uploads/1/3/5/3/135309858/vonig.pdfIn PDF document text
    • https://cdn.sqhk.co/pujapipiwat/gcZhaje/transfer_contents_of_iphone_to_new_iphone.pdfIn PDF document text
    • http://mosebuzixat.mywebcommunity.org/transformational_leadership_in_nursing_journal_articles.pdfIn PDF document text
    • http://luwogexejel.getenjoyment.net/hp_officejet_6500_spare_parts.pdfIn PDF document text
    • https://mutabezikubi.weebly.com/uploads/1/3/4/7/134739743/8ab2a25b37.pdfIn PDF document text
    • https://cdn.sqhk.co/niramojiga/R3C8ghb/red_bouncy_ball_4_mod_apk.pdfIn PDF document text
    • https://mopuvavipobum.weebly.com/uploads/1/3/1/0/131070525/vigivokafe-vegew-kemifik.pdfIn PDF document text
    • https://tulijibukabez.weebly.com/uploads/1/3/0/8/130814483/1862135.pdfIn PDF document text
    • https://pobunusegem.weebly.com/uploads/1/3/4/4/134460984/d37c1b3d.pdfIn PDF document text
    • https://cdn.sqhk.co/kubarevopew/idU7adW/idle_tycoon_space_company_antimatter.pdfIn PDF document text
    • https://cdn.sqhk.co/videgogaf/yjhhfEg/bo4_zombies_level_up_special_weapon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gezixus.myartsonline.com/vopagiwide.pdfIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/73567216989.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_off0000fc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC78 5544 bytes
SHA-256: db13d75c99a6243c94e1b7479110b61028193ec1721269eacfd6de997cb6080a
font_01_sfnt_off00010f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3C 11096 bytes
SHA-256: dd6dbd82dfaf017d2c157a8f27fb4f7d0c8846bbe06fdf628e684d0aa2b0cce5

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