Malicious PDF — malware analysis report

Static analysis result for SHA-256 714b8a171a346ba5…

MALICIOUS

PDF

68.7 KB Created: 2021-02-20 09:01:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 6db965664ed66afde310de18ca41b4f9 SHA-1: e177c84b6900818339e0db684eb47bc35f74b71b SHA-256: 714b8a171a346ba55c26d40a7d43d1251221fb718704d387d618dc16e2fa3afc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs and is identified as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

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/strik?utm_term=betty+crocker+cookbook+vintage PDF link annotation
    • https://malafusid.weebly.com/uploads/1/3/2/8/132815748/vasivi.pdfIn PDF document text
    • https://cdn.sqhk.co/konafomaz/bXnhchf/jurassic_park_survival_mod_apk.pdfIn PDF document text
    • https://litukepulaj.weebly.com/uploads/1/3/4/8/134863372/9982110.pdfIn PDF document text
    • https://binemipo.weebly.com/uploads/1/3/0/8/130874238/ab466ea3236cc9b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425924/normal_5fccdf46eb910.pdfIn PDF document text
    • https://wepusetu.weebly.com/uploads/1/3/2/6/132695333/6144470.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454171/normal_6027747610bc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384851/normal_6021f0161f406.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408464/normal_5fdefaa1304bd.pdfIn PDF document text
    • http://mavpa.fun/wunazidkl1p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483103/normal_60214f04a473b.pdfIn PDF document text
    • https://cdn.sqhk.co/ravawiku/5UNgehb/leruxikub.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/godewumazek/87809211800.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/ielts_test_questions_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/runilawijuk.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_off0000cb69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB69 5172 bytes
SHA-256: b4ff52bddbec5691185aed3ddf5e1bfbd82f9a7fc5a797d80e3d72410e93a512
font_01_sfnt_off0000dd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2F 12912 bytes
SHA-256: cbc650aa5fd3a251d0d411005d5b4b45ddc342b82efd65f6269f81278dff93b4

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