Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d80cf4897a764bd…

MALICIOUS

PDF

70.9 KB Created: 2021-02-12 22:52:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 730b854b11cee16c69dab7c01a7c8c72 SHA-1: 37a61c233d591d7c756dc57c753e5dc01c4de093 SHA-256: 4d80cf4897a764bd240b36289f82f1572558e58076eda9e8a3b11a664a2f936e
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=read+eldest+online+pdf PDF link annotation
    • https://pegepujime.weebly.com/uploads/1/3/1/4/131453637/lumugusujosere.pdfIn PDF document text
    • https://golisarupu.weebly.com/uploads/1/3/5/3/135317681/bokisegum.pdfIn PDF document text
    • https://valexipeval.weebly.com/uploads/1/3/0/7/130775413/xukelutisu.pdfIn PDF document text
    • http://arm-watch3.club/812588721792uike.pdfIn PDF document text
    • https://toruvorunivigu.weebly.com/uploads/1/3/5/3/135317855/8493224.pdfIn PDF document text
    • https://nawivavunof.weebly.com/uploads/1/3/4/6/134669961/8770310.pdfIn PDF document text
    • https://xepozumer.weebly.com/uploads/1/3/1/3/131380160/xuvomakudu_wezuk_wawarakuk.pdfIn PDF document text
    • http://ketousa.site/the_miseruvjfg.pdfIn PDF document text
    • https://cdn.sqhk.co/madagijoj/jidNhbh/escape_room_the_apartment_game.pdfIn PDF document text
    • http://zhenskiizhurnal.ru/euchre_for_dummies7s9u1.pdfIn PDF document text
    • http://hangookoil.ru/84320010767ez2yo.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/fonazuzixagizir/saki_saki_full_song_320_kbps.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/php_mysql_format_date_output.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/2674676395.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/katefe.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_off0000d98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98B 4948 bytes
SHA-256: 355e1a0807c83c54669413edc2e072eba6a915363583fde8149e1c538825a34d
font_01_sfnt_off0000ea82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA82 10720 bytes
SHA-256: c14d3d598fbc9b522b9dd33264d2af5ec6cf15993cb8f5be6dd8aa1a3e43500f

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