Malicious PDF — malware analysis report

Static analysis result for SHA-256 da35cfc69c6d753e…

MALICIOUS

PDF

92.5 KB Created: 2021-01-16 05:20:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 738ca4c60f051852ac412e625fe6e1a6 SHA-1: 1b1316ddf8ce7dc4c47379bc5bbe6ad48e19bb6a SHA-256: da35cfc69c6d753e4640d7ac25f8bd28e9f107ecbbfaef16be7dce362b27e131
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly and S3 domains, characteristic of SEO link farms used to manipulate search results or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and extensive external linking suggest it's designed to redirect users to potentially harmful websites.

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=fellowes+powershred+79ci+best+buy PDF link annotation
    • https://kiloroxo.weebly.com/uploads/1/3/0/8/130813762/nimanoximaze.pdfIn PDF document text
    • https://tozadifoxu.weebly.com/uploads/1/3/4/9/134904498/1935687.pdfIn PDF document text
    • https://mepafuxutare.weebly.com/uploads/1/3/4/6/134660934/5b8bf3948c1e.pdfIn PDF document text
    • https://site-1177565.mozfiles.com/files/1177565/asmr_darling_breakfast.pdfIn PDF document text
    • https://cdn.sqhk.co/wuxofepure/jdhdmhd/bullet_force_game_download_for_pc.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/riwidovotasefud.pdfIn PDF document text
    • https://site-1180155.mozfiles.com/files/1180155/tozuvapavepamokiv.pdfIn PDF document text
    • https://gazewowotom.weebly.com/uploads/1/3/4/6/134616189/fuzatokeloduj_zuwabalomaf_vewimoxenowa_falifu.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/vabedafozo/bitlord_for_macbook.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/84188997469.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/how_to_feed_in_skyrim_as_a_vampire.pdfIn PDF document text
    • https://s3.amazonaws.com/dazemi/sofiwasurujewuga.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/beamer_template_for_thesis_presentation.pdfIn PDF document text
    • https://s3.amazonaws.com/gonavo/10405193747.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/xagoxib.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/zetigelafowigibepodorixa.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/52458146278.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_off00012ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA5 5476 bytes
SHA-256: cb3a1075febfc5747e83854d53918658edb3cb5fb5e7804e3e5c17df54f0d59a
font_01_sfnt_off00013e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E5A 10944 bytes
SHA-256: c8e4fd25a9aa38dbf0fbd5328bb7950dc0449926be8107724eb48339879c5c09

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