Malicious PDF — malware analysis report

Static analysis result for SHA-256 6072322ac68a2573…

MALICIOUS

PDF

72.2 KB Created: 2021-02-18 20:07:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 59211cf4e755e356eb6b786032d8f919 SHA-1: d541c0ff4f01d364aa167b2efa7c80481cd583a3 SHA-256: 6072322ac68a2573386b3894bf5a4f4d98bb2124d35086e57b4cde8aff03f2d7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The embedded URLs and the nature of the heuristics strongly point towards an attempt to redirect users to malicious or deceptive websites.

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://maypoin.ru/123?utm_term=1996+polaris+magnum+425+4x4+value PDF link annotation
    • https://vufupobuzalezu.weebly.com/uploads/1/3/4/8/134853030/675227.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491925/normal_5ff97aa91ae79.pdfIn PDF document text
    • http://keysecret.ru/gcse_sine_cosine_rule_worksheetrt0jv.pdfIn PDF document text
    • http://activa-fb.com/blouson_semi_formal_dressjuaza.pdfIn PDF document text
    • http://douchehq.xyz/16448900673hxw6t.pdfIn PDF document text
    • https://cdn.sqhk.co/karadirimose/jse8tv2/ac_dc_guns_for_hire_youtube.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495402/normal_60053f79f09b5.pdfIn PDF document text
    • http://cybety.xyz/29974351835l9wdc.pdfIn PDF document text
    • https://cdn.sqhk.co/vodadavubex/hd2iajh/dinosaur_world_live_cheap_tickets.pdfIn PDF document text
    • https://cdn.sqhk.co/tukutabu/j4YBEhh/halloween_town_pumpkin_patch_on_rainbow.pdfIn PDF document text
    • https://dabosimupit.weebly.com/uploads/1/3/5/3/135397997/fb4ace8a2ad4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445125/normal_60226cee0663a.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/hSihNjc/pc_builder_sim_free.pdfIn PDF document text
    • https://menuwenuxunok.weebly.com/uploads/1/3/4/6/134682317/xexatidojulam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/57387307634.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_off0000d821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD821 5880 bytes
SHA-256: debd58622ae71e1b0ac2cab617883e8cdff32c582791b6b7f5961eb55bced4cf
font_01_sfnt_off0000ec19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC19 11448 bytes
SHA-256: 68734019872fa16afb229c632ab60d2d72a6bb6def0351feaae99fe254815198

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