Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4daa8c12538e3eb…

MALICIOUS

PDF

70.7 KB Created: 2021-02-15 21:16:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b5ac0aba82495af9cb3abdc365781d24 SHA-1: 4cdc3cd613522defed15c75db8cbece92d732526 SHA-256: c4daa8c12538e3eb8335ffd88ba596a8c602f64eb1475de701e0f0595c88bf41
134 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and contains an embedded URI pointing to a suspicious domain. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of hosting multiple PDFs on disposable domains, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains text related to 'cbi interrogation' and 'wkhtmltopdf', which may be part of a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://baarspo.ru/aws?utm_term=what+happens+during+cbi+interrogation PDF link annotation
    • https://buwabasowo.weebly.com/uploads/1/3/4/3/134353515/2abe9edd3c2a009.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413583/normal_5ff02e5a89f1d.pdfIn PDF document text
    • http://jojalipubawil.22web.org/hungry_dragon_mod_apk_1._33.pdfIn PDF document text
    • https://fuwupizur.weebly.com/uploads/1/3/5/3/135390256/kojexepe-gomumirafiv-bidigakur.pdfIn PDF document text
    • https://cdn.sqhk.co/jeforije/lhejidx/vigepajebajeselibuba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rukateridexak.rf.gd/46319507562.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/dobusotukilanumedasi.pdfIn PDF document text
    • http://sukasorepej.rf.gd/89163841945.pdfIn PDF document text
    • http://pixagikaw.epizy.com/bopafosazafibudaxuk.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/tipuribexefireku.pdfIn PDF document text
    • http://xavisijividefo.epizy.com/benexewowipos.pdfIn PDF document text
    • http://wijexaxowakovan.rf.gd/57406545201.pdfIn PDF document text
    • http://ferenekukosazu.epizy.com/c_a_p_full_form.pdfIn PDF document text
    • http://xenamijexutagus.epizy.com/press_kit_cover_letter_template.pdfIn PDF document text
    • http://sebipukavore.epizy.com/google_drive_blank_calendar_template.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/37335949053.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/tomizebewokanenaxe.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_off0000d810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD810 5456 bytes
SHA-256: aa7719d7fc5588c5baace41014abd3fb8b07bb1949db0846097b43335aaf3f59
font_01_sfnt_off0000ea9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9E 10188 bytes
SHA-256: e085a2b9aedaeb19b635c269f8dd9306e54d8ed48ea549cf3ba1a12b921358d0

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