Malicious PDF — malware analysis report

Static analysis result for SHA-256 80eee76c1a99537a…

MALICIOUS

PDF

69.8 KB Created: 2021-02-15 23:24:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 49cb272eba5f8e1d2f0a201295cd471a SHA-1: 3254af1e660611ff98d0f3a2aa6fa2dd88db65e8 SHA-256: 80eee76c1a99537a1c4ecd73381e8ad66c8a15bfad3a80830754ff356878f6a6
126 Risk Score

Malware Insights

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

The PDF document was identified as malicious by ClamAV and an ML classifier, and contains numerous external URIs. The document body, though heavily obfuscated, appears to contain metadata related to the 'Boss gt-6 manual mode' and the wkhtmltopdf application, suggesting a lure. The presence of multiple disposable and potentially malicious domains indicates a link farm designed to redirect users to other malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=boss+gt-6+manual+mode PDF link annotation
    • http://usesalon.xyz/dividing_decimals_by_powers_of_10_worksheetsp0kd2.pdfIn PDF document text
    • http://metryck.info/megalovania_clarinet_sheet_music_solokf3le.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385030/normal_5fef46161babf.pdfIn PDF document text
    • https://cdn.sqhk.co/kerametunal/jdgidgi/disney_bundle_hulu_commercial_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418001/normal_6023410ba9454.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414176/normal_6021d7f4c311b.pdfIn PDF document text
    • https://cdn.sqhk.co/pawekenu/bgczAjt/tank_battle_world_war_2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481291/normal_5fde4f1e62f1d.pdfIn PDF document text
    • http://reborasiruv.iblogger.org/lagu_alyah_purnama.pdfIn PDF document text
    • https://cdn.sqhk.co/metexemoraga/jizeIhi/movedom.pdfIn PDF document text
    • https://cdn.sqhk.co/dulidara/Rhahhhc/sonic_adventure_2_dreamcast_black_market.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368240/normal_601a9d43f1c3c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://poluxik.epizy.com/28165531702.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/aadhar_card_without_otp_no.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_off0000cd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6E 5284 bytes
SHA-256: 4bff3facf8f218cae695a5eeccfafa3373b1e575a1bc861df51694f5b87fc573
font_01_sfnt_off0000df5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5E 13620 bytes
SHA-256: 377074da82e19883279bcc3b1f246d3f814a855ea88f01c10bb4b9886db687c0

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