Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c94d304f646cc0…

MALICIOUS

PDF

90.0 KB Created: 2020-12-23 10:11:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 104ac04f1e843e2f8f515b42ffb058af SHA-1: 9687b883ad4bca39c9349013fb895da39384ba48 SHA-256: b7c94d304f646cc0ab88aa4f76c5d80a4358132d76b980763190400de0719e09
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://traffset.ru/strik?utm_term=torn+meniscus+radiology PDF link annotation
    • https://jixiriramoke.weebly.com/uploads/1/3/4/3/134320492/3e12328a5ff.pdfIn PDF document text
    • https://kumajevebak.weebly.com/uploads/1/3/1/8/131856027/1680234.pdfIn PDF document text
    • https://netopanuneju.weebly.com/uploads/1/3/4/4/134493403/novofafu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370077/normal_5f8deb6b0d691.pdfIn PDF document text
    • https://tadeganerusoza.weebly.com/uploads/1/3/1/4/131438541/xoladidara.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490272/normal_5fcbf0578f685.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426960/normal_5f9ff043276cf.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/senodiw/angadi_theru_ayngaran_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/sibenuvokiwuz/accountable_talk_bookmarks.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc573c9116eb00e3c6aa558/t/5fcd0bd42bc7884852b909cf/1607273430281/87106399725.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5eed0147-6e2d-4356-a3ca-70bbea6985c7/players_handbook_dnd_4e.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdea7f851e6b539731cab78/t/5fdec10e7f4e6a3367299ea2/1608433935330/60841313552.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_off000122ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FF 5308 bytes
SHA-256: e38905ff34ea666a72b5c6b00c9562368195cd8b1fb277c148cce28be1e770d9
font_01_sfnt_off000134fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134FD 11240 bytes
SHA-256: 543cacba59ac33992ed79b855280bf9b11e0230f813a2e01b921b9a3d0f40752

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