Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa21f6764b7b4337…

MALICIOUS

PDF

76.0 KB Created: 2021-03-01 00:56:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 762b20428ce03f6450e26cb7182d5159 SHA-1: b919c015976668529d19090775b308c673054e08 SHA-256: aa21f6764b7b4337d7fb73a6d7ac80d777026b8a30ace812ebb8758c8fe8cb9b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, characteristic of a link farm designed to improve search engine rankings or distribute malicious content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML classifier score strongly indicate malicious intent. The document body, though partially corrupted, suggests a lure related to downloading content, which is further supported by the embedded URLs.

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://dugedepap.ru/award?keyword=under+the+dome+season+2+episode+1+free+download PDF link annotation
    • https://luvabuzizav.weebly.com/uploads/1/3/5/2/135294148/7674819.pdfIn PDF document text
    • https://ruvudiroxutorag.weebly.com/uploads/1/3/0/7/130775702/nizobadigeg_metowixubizani_lupitejag_lalisije.pdfIn PDF document text
    • https://veguxalefimas.weebly.com/uploads/1/3/1/3/131382166/3403002.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/piwanisaj/beyblade_metal_fury_android_game.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/bookmark_portfolio.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/59168145240.pdfIn PDF document text
    • http://gigavolaxo.epizy.com/63949242713.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/pubujiwafekaranutoma.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/bengali_movie_site_name.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/ntse_answer_key_2017_gujarati.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/my_dvr_keeps_rebooting.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/35312880957.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/tilepuxin.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/class_10_biology_handwritten_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/creative_writing_worksheets_for_highschool_students.pdfIn PDF document text
    • http://pugapugene.rf.gd/bicol_regional_march_lyrics.pdfIn PDF document text
    • http://vamuxusonepuf.rf.gd/vinarilaral.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/euipo_guidelines_enhanced_distinctiveness.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/85962724229.pdfIn PDF document text
    • https://s3.amazonaws.com/pojikovewijeja/peavey_vypyr_30w_modeling_amp_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_off0000eae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE0 5548 bytes
SHA-256: 0c23483af246a0180615762862b5808f035a09fcb6de9b9e3956e39194b8791f
font_01_sfnt_off0000fdb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB1 10720 bytes
SHA-256: 2e77d41c7463c7a5ea29993d065c8a48779d7731dcb346991f052a80674e0cd2

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