Malicious PDF — malware analysis report

Static analysis result for SHA-256 54504e33ca805419…

MALICIOUS

PDF

76.8 KB Created: 2021-02-07 08:04:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 3e3b22c97431cf49ecbbe65d4ba1aba5 SHA-1: 1656f7454036eefc07094b24026081c556df76ee SHA-256: 54504e33ca805419560df2e09ed04f917855f274a9c645e488476f1655ae3803
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to 'Metabolism of bilirubin pdf'.

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://seumenha.ru/aws?utm_term=metabolism+of+bilirubin+pdf PDF link annotation
    • http://triple-doska6.club/2508411722yb3l2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369520/normal_600af503c7f9d.pdfIn PDF document text
    • http://lnstagramverifycentre.com/befedebetegepanefof2yodr.pdfIn PDF document text
    • https://motuzepiruwilo.weebly.com/uploads/1/3/4/3/134348631/bca3598.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489237/normal_5fd337e411fbd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444100/normal_5fed0a5dc7157.pdfIn PDF document text
    • http://firstsecu-paypal.com/heroic_meaning_in_marathi90324.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374703/normal_5ffb690c3a454.pdfIn PDF document text
    • http://mnatural.space/56820861752sanhn.pdfIn PDF document text
    • http://kinokaiff.space/tulosafememokumimozutetaopkus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vezufokat.rf.gd/academic_reading_skills_book.pdfIn PDF document text
    • http://riruvilanofaz.rf.gd/berceuse_faure_sheet_music.pdfIn PDF document text
    • http://rexonaboruli.epizy.com/cheque_voucher_template_excel.pdfIn PDF document text
    • http://bufarudewigufeb.rf.gd/suddenly_seymour_sheet_music_piano.pdfIn PDF document text
    • http://tafinefonekon.rf.gd/2014_camaro_ss_1le_owners_manual.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_off0000efba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBA 5332 bytes
SHA-256: a9b66b7e116f9df06cdd037192f303345e8167712445564ac65131b6a0821b83
font_01_sfnt_off000101c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C6 10896 bytes
SHA-256: 5325d0927ef475ea03ea65b1d5ea63aab753cd32d418d68fa3353e7a1fed8c8d

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