Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7326d3e8a3fef56…

MALICIOUS

PDF

71.6 KB Created: 2021-02-14 06:20:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 21dd07f3529665ecdcc1bfef8ead67f8 SHA-1: eeb49c046fff650ce54269e625f82e1c990119e2 SHA-256: e7326d3e8a3fef56a22480c6014f7ca0acf484f63dcf91d16c19465540e9e025
166 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains and Weebly subdomains, indicative of a link farm used for phishing or malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be part of a multi-stage attack involving a password-protected archive. The ML classifier and ClamAV detection strongly indicate malicious intent.

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://maypoin.ru/123?utm_term=bhs+library+weebly PDF link annotation
    • https://pilonalamajavex.weebly.com/uploads/1/3/1/1/131164122/1ce8e84.pdfIn PDF document text
    • http://jilet1.club/872338556963rr1g.pdfIn PDF document text
    • https://nodifolosorak.weebly.com/uploads/1/3/4/7/134758422/gaxusawuginuwoxojaxu.pdfIn PDF document text
    • https://nubeboganiroj.weebly.com/uploads/1/3/1/3/131384383/tafezulado_xiziwigube_fogewiv.pdfIn PDF document text
    • https://xoxumowuna.weebly.com/uploads/1/3/5/9/135964844/demisaxexe.pdfIn PDF document text
    • http://reborasiruv.iblogger.org/black_widow_song_ringtone.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/2953310.pdfIn PDF document text
    • http://suvarelis.22web.org/jabilamurigixisavalesipor.pdfIn PDF document text
    • https://wawotisusuwo.weebly.com/uploads/1/3/2/7/132741293/488590.pdfIn PDF document text
    • http://xeeewq.xyz/ginawapuv929fs.pdfIn PDF document text
    • http://verekozugotised.22web.org/43656027069.pdfIn PDF document text
    • https://josazosanika.weebly.com/uploads/1/3/4/3/134339908/kupasiwob-wanibozutug-feninotidimibef.pdfIn PDF document text
    • https://guxozagubixox.weebly.com/uploads/1/3/1/4/131437827/gobowizogelur_lupuv_petubiduk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tavawefojob.epizy.com/vorisalififajowomoge.pdfIn PDF document text
    • http://fuginifetulad.epizy.com/restaurant_guide_michelin_paris_9.pdfIn PDF document text
    • http://getojigukas.epizy.com/21386408055.pdfIn PDF document text
    • http://noporotosodapo.epizy.com/super_fund_binding_nomination_form.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_off0000da42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA42 5156 bytes
SHA-256: c5cb1f8040d3b1242b5d01896c1631ae6e4761090392e2d5624ade10e0564438
font_01_sfnt_off0000ebd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD7 11032 bytes
SHA-256: a531249dfb11225748cb1baa47a9e914c363b203fdbcb75a2e91197149bbef86

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