Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d94174e4d14c9c8…

MALICIOUS

PDF

78.7 KB Created: 2021-02-14 10:55:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 36099c79d1304ff0b81c7da78fac7797 SHA-1: d6f522ef8f1f9a58260a27b30d6c8d596a58cd60 SHA-256: 8d94174e4d14c9c80dc532972952c6239f9421f0235aab6da7cf6d6a79379f0a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, with a significant heuristic identifying it as a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the link farm heuristic suggest an attempt to redirect users to malicious content.

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://druttle.ru/123?utm_term=the+aeneid+by+virgil+translated+by+robert+fagles PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403806/normal_5fd610a03efa3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484609/normal_5ffb31d00bf08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383699/normal_6010926baad3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393018/normal_6024cf4c38474.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475582/normal_5fd14a5222241.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481154/normal_60196bbc8207f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468534/normal_5fe2295a013ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379974/normal_5ff340dd7a3a6.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/xuxifuzituwu/transition_words_worksheet.pdfIn PDF document text
    • http://surifetopene.epizy.com/cisco_sg350x-_48p_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/angiotensin_ii_receptor_blockers.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/detoxufusasumig.pdfIn PDF document text
    • http://bobosuvediv.epizy.com/fenova.pdfIn PDF document text
    • http://towawopijoxodor.rf.gd/daxavusejajupixolomewa.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/xoveraxewugepovikok.pdfIn PDF document text
    • http://livofos.epizy.com/kudubov.pdfIn PDF document text
    • http://pusaxedufa.rf.gd/bexigulufara.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/fidujusolon.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF640 5420 bytes
SHA-256: af504a1669abacff367d1dbdf345e25ae133218313e68d818adf0461226b0c58
font_01_sfnt_off000108b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B5 10688 bytes
SHA-256: 3834b0a61f007f41e1c2b66714e2610761c64304e4e32b700313df5a26c50e62

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