Malicious PDF — malware analysis report

Static analysis result for SHA-256 243310f95e5c7fc2…

MALICIOUS

PDF

71.6 KB Created: 2021-04-02 20:40:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b9842e615d3071cad89c391a87d7d300 SHA-1: d95a0aa5b6a5bbfba07d3972e3e4d791970707d7 SHA-256: 243310f95e5c7fc2f8b39e45233377eb2c55c7f2a9a5fa259c3616a0d2a895ab
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, with at least two pointing to suspicious domains that are part of a link farm. The document body, though heavily obfuscated, appears to contain keywords related to vehicle parts, likely as a 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://ponafet.ru/strik?utm_term=fram+oil+filter+ford+3000+diesel+tractor PDF link annotation
    • http://gakemuxuk.22web.org/quantum_explanation_of_photoelectric_effect.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465144/normal_6029dfb2959f0.pdfIn PDF document text
    • http://sexugaweguko.iblogger.org/toyota_auris_hybrid_estate_performance.pdfIn PDF document text
    • https://cdn.sqhk.co/ramowejub/dihfv2q/dupimolujopujaxega.pdfIn PDF document text
    • https://cdn.sqhk.co/nowonipewo/eSeifjc/10986569372.pdfIn PDF document text
    • https://cdn.sqhk.co/juxezijafoz/MhbjgMY/piano_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/goronikel/iihhc2w/gizmohub_apple_watch.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497688/normal_6029648da3441.pdfIn PDF document text
    • https://cdn.sqhk.co/desogepupema/6jhyLLH/11839456703.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391315/normal_5fc90abf87187.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/fizaxo/the_impossible_quiz_question_39_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/79198805294.pdfIn PDF document text
    • http://zenoridofagokev.epizy.com/swords_and_sandals_2_skills_guide.pdfIn PDF document text
    • http://pewukexi.epizy.com/jonazota.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/fusionner_plusieurs_foxit_reader.pdfIn PDF document text
    • https://s3.amazonaws.com/makixibawumebol/quotes_from_sisterhood_of_the_traveling_pants_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/colored_glass_sheets_hobby_lobby.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_off0000dbf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF6 5428 bytes
SHA-256: 118b1353d5b0ffc3204d2613781528677d0dabe738c9a837336b90eccaf31668
font_01_sfnt_off0000ee56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE56 10204 bytes
SHA-256: 52e0ae9d7a139a3d764f161f47b80933cd0f3829ffc3b15b72e4d534bbc8f4a5

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