Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9343f3c25eb92ee…

MALICIOUS

PDF

77.3 KB Created: 2021-01-08 18:14:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: c2a3a448d9adb9ba388eb63dc88881eb SHA-1: b86d0b34ddd9297b4aec85113f76c97e186cd54c SHA-256: b9343f3c25eb92ee4afc298da35be08983aaa4fe1d7704d9acf7bf558f0d1d76
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a ClamAV detection, specifically flagging it as a phishing trojan. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the ML classifier output strongly indicate malicious intent, likely to direct users to phishing sites or download further malicious content.

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 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://traffset.ru/123?utm_term=haylie+pomroy+pdf PDF link annotation
    • https://cdn.sqhk.co/lilapanorup/ahierhd/spirit_halloween_animatronics_2017.pdfIn PDF document text
    • https://cdn.sqhk.co/potekovibe/WJihgBu/dog_simulator_games_free_offline_2020_sheep_dog.pdfIn PDF document text
    • https://xikudamoxi.weebly.com/uploads/1/3/4/5/134576601/sadov_tatizavenago_jibevedamabitos.pdfIn PDF document text
    • https://sewuvemap.weebly.com/uploads/1/3/4/3/134377394/ludixogetibomagomegu.pdfIn PDF document text
    • https://cdn.sqhk.co/nepasibuta/gjjdgMP/game_like_matchington_mansion_ad.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/figugipopar/microsoft_sql_licensing_guide_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/85138334783.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/freelance_fashion_designer_contract_template.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/sazisi.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/spring_constant_lab_report_conclusion.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/vinnic_l1028f_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/sebi_guidelines_for_venture_capital_slideshare.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_off0000efe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE0 5072 bytes
SHA-256: d0ee656484838f9d1de4ce64c6a04f049ce794e307a897dee9f1c2bc2844886a
font_01_sfnt_off00010116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10116 11592 bytes
SHA-256: 6d3542535a473e9da40f2816e6b36da51db608b22ecbeb26241f6ac37ae470e3

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