Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f640aaad1d9c0f6…

MALICIOUS

PDF

89.5 KB Created: 2021-01-12 04:24:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4da73fe6f09c1056f854b7ce1db73c4a SHA-1: 7d6b4fd8966bef7c03e1d796a9fd7b1331412857 SHA-256: 6f640aaad1d9c0f670b0f5850702fc6e4010a121a5f9e16aa69bbaa852218305
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation scheme. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly suggests maliciousness. The presence of embedded URLs and the nature of the link farm suggest a potential phishing or malware distribution vector, possibly initiated via spearphishing attachment.

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://trafffi.ru/123?utm_term=nietzsche+zarathustra+pdf PDF link annotation
    • https://site-1179315.mozfiles.com/files/1179315/47731674510.pdfIn PDF document text
    • https://cdn.sqhk.co/pirujezexod/ewhdig9/27388039351.pdfIn PDF document text
    • https://nokajadum.weebly.com/uploads/1/3/4/8/134887388/40863.pdfIn PDF document text
    • https://zuwukozoxuwiged.weebly.com/uploads/1/3/4/7/134713444/fuzazogafewezoz.pdfIn PDF document text
    • https://fubuzupa.weebly.com/uploads/1/3/5/3/135324320/migowapusubekor.pdfIn PDF document text
    • https://giginepa.weebly.com/uploads/1/3/4/3/134389182/c6046e158b3f.pdfIn PDF document text
    • https://site-1173857.mozfiles.com/files/1173857/lineage_2_revolution_resmi_forum.pdfIn PDF document text
    • https://wabelurotetef.weebly.com/uploads/1/3/4/6/134693048/0e4dfd.pdfIn PDF document text
    • https://cdn.sqhk.co/rijakobebux/eNlaihQ/wajevotugukotomexoji.pdfIn PDF document text
    • https://cdn.sqhk.co/luxixumogez/hgRsgc9/english_20-_2_reading_comprehension_practice_test.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493198/normal_5fe6a4be1a4a3.pdfIn PDF document text
    • https://site-1168038.mozfiles.com/files/1168038/96664729380.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwasusul/cXdjev8/86177480192.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00011e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E60 5228 bytes
SHA-256: 1fffdb00fd0a678f74764a50f66c4e4009788411e07defab18f3747af9e93dce
font_01_sfnt_off00013035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13035 12084 bytes
SHA-256: adbea3dbd5f8d236fa52d4f28f615d6fb2ba957e89902795cbe51106a695e72b

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