Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd8f31679302d886…

MALICIOUS

PDF

79.7 KB Created: 2021-03-14 08:44:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 04f2d0b90efc44e155d2aec6d56904cf SHA-1: 31d7cb08f4298d576207239e53e328b22bfdf306 SHA-256: cd8f31679302d8868a4de04586f3c7064a7f02234d57ac873306a42357445a0d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 5

  • 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 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/wix?keyword=rogue+trader+class+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4494657/normal_5ff653466bc54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490256/normal_6016b67e92663.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375907/normal_602ca3f9507e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496204/normal_6008f5101167a.pdfIn PDF document text
    • https://cdn.sqhk.co/xixumobun/gXDKagf/67705615207.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388422/normal_603506ea96900.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453730/normal_5ff7d67b47e21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372361/normal_603b59646d16c.pdfIn PDF document text
    • http://dutuxagedam.66ghz.com/10148478190.pdfIn PDF document text
    • http://lightly.store/91202054355eviy4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412394/normal_5fea3633731c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452834/normal_5fe175a573624.pdfIn PDF document text
    • http://runmasten.online/nepoxulireraga5d5z1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416660/normal_5fd9b6d94e41e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368506/normal_60254c7481ed6.pdfIn PDF document text
    • https://cdn.sqhk.co/sajatanugeg/JieEkjg/57611731353.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuvunemomot.epizy.com/casserole_crock_pot_manual.pdfIn PDF document text
    • http://mosasawimip.epizy.com/allergic_rhinitis_diagnosis_guidelines.pdfIn PDF document text
    • http://vimozav.epizy.com/21389802785.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_off0000fa72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA72 5112 bytes
SHA-256: c75863057a16b8da51b96883964649f8c9732b793a3965fa056e131c4a5a419c
font_01_sfnt_off00010bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEC 10596 bytes
SHA-256: a8e8fb57424d9b4bb5a69adb1a62d2e95167ea64a94794957c32de2ee5c969d2

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