Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f9a261fb269cb06…

MALICIOUS

PDF

66.1 KB Created: 2021-03-03 19:02:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5e83cd7c2c59e985c9e8a5c8797e0ed3 SHA-1: 9a3a8a726fe908e4fe0d47e782c1ba998d362885 SHA-256: 9f9a261fb269cb069066a3b4f6899d4672cfac29506065cb8828190427c2671f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or scam campaign. The presence of external URIs and link farm heuristics further supports this, indicating the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://midufefew.ru/123?utm_term=doc+watson+deep+river+blues+tab+pdf PDF link annotation
    • http://idealslimitalia-official.site/lenovo_ix4-300d_manualub8eg.pdfIn PDF document text
    • https://monemoret.weebly.com/uploads/1/3/4/6/134667898/beb81d6e7e7071.pdfIn PDF document text
    • http://goodsun.space/83532955271qehy2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472763/normal_603a8e6458c8d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409609/normal_5fe2b1ef4b89a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472775/normal_6018338cbd36e.pdfIn PDF document text
    • https://neletataw.weebly.com/uploads/1/3/1/3/131398134/ede527.pdfIn PDF document text
    • http://resimpub.com/3845716310kxb9v.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/dazovosugev/pabisisorovojeti.pdfIn PDF document text
    • https://s3.amazonaws.com/xapota/55042272486.pdfIn PDF document text
    • http://tiluxusimutine.atwebpages.com/41830906462.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/90284870432.pdfIn PDF document text
    • https://s3.amazonaws.com/siwixomudit/three_6_mafia_most_known_unknown_zip.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_off0000c24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC24E 5440 bytes
SHA-256: 592eb5173f2e1273ce11f5fdbb9462921c887d4e4e52972c1a6a2528b7b35b82
font_01_sfnt_off0000d4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FA 11932 bytes
SHA-256: f3757ce05358851aebf9b8a77236cfac5895a7b1a5b06affed19b9946f28da12

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