Malicious PDF — malware analysis report

Static analysis result for SHA-256 007354fc44b55213…

MALICIOUS

PDF

74.4 KB Created: 2020-12-20 11:21:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6bd671d1764df3ed55e6ac45bde43d2e SHA-1: 1958730714b6324a71b190d095e6b9c7654fa9f8 SHA-256: 007354fc44b55213b816e447126e5961d1f6736cdbbcb7a9a7d98e7150bb48eb
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness, with the primary purpose appearing to be directing users to potentially harmful external sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest an attempt to leverage external resources, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 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://trafffe.ru/strik?utm_term=domaine+de+broglie
    • https://loxekezipoga.weebly.com/uploads/1/3/4/6/134678149/679099.pdf
    • https://sixapinipuso.weebly.com/uploads/1/3/1/3/131384402/mujivura-nonipumumim-novixikumajo-bokux.pdf
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/7885719.pdf
    • https://lopiranurepo.weebly.com/uploads/1/3/4/7/134735856/e060a605504.pdf
    • https://wesotapaxo.weebly.com/uploads/1/3/4/4/134488604/4f2f73.pdf
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/vudodapazepipux_kijemomebegax_velagokotukif.pdf
    • https://mubojage.weebly.com/uploads/1/3/4/3/134377346/lipexol.pdf
    • https://xebikazogede.weebly.com/uploads/1/3/2/7/132740990/botekajevones.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc5a2fbff13940aa25fd184/t/5fcf93aafaf0bc04d1d18ade/1607439277067/easy_hockey_shootout_moves.pdf
    • https://static1.squarespace.com/static/5fc18272ff13940aa243ecad/t/5fc6776d3570fb44d1e241e6/1606842223137/how_to_draw_halloween_stuff_for_kids.pdf
    • https://static1.squarespace.com/static/5fdd363137a75c289d58a145/t/5fde46c36a6ad7222f11d814/1608402627859/rs_kalphite_queen_solo_guide.pdf
    • https://uploads.strikinglycdn.com/files/d0923234-023b-4f93-a32d-9648775f1663/68623872843.pdf
    • https://uploads.strikinglycdn.com/files/af1c461f-0319-445b-a5eb-37a51e9bddc8/zibefogaf.pdf
    • https://s3.amazonaws.com/piwanisaj/brooding_by_victoria_orenze.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e288.bin
fc9ca1d58b4a07ff899240bde2012b950d44d7ad9c590d363ef4c6e3c9425049		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE288 5104 bytes
font_01_sfnt_off0000f3c9.bin
b1f913cf6a3dae5519e46d17d60c77ccdd962d9605b5379102a2e3566fc6bd58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C9 12732 bytes

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