Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e3f726357208e70…

MALICIOUS

PDF

76.5 KB Created: 2020-11-11 21:34:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3a02a19bf9acae556f53fa9c236d0155 SHA-1: c3b2e67731125db9c95495914a2a2d1dcd11ac1d SHA-256: 3e3f726357208e706fa8f09b8fb91b24a8378b7c85ba6331c270097b8d326236
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' suggesting a large number of outbound links. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users.

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://trafffi.ru/aws?utm_term=what+you+up+too+answer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422145/normal_5f9bec8244e04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383327/normal_5fa1b996deb59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410222/normal_5fa388a062c2f.pdfIn PDF document text
    • https://deperomider.weebly.com/uploads/1/3/4/3/134344929/5867720.pdfIn PDF document text
    • https://funudenor.weebly.com/uploads/1/3/4/3/134319253/5726544.pdfIn PDF document text
    • https://xalipifizipig.weebly.com/uploads/1/3/1/3/131379045/de28024b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369163/normal_5f8e2a364127a.pdfIn PDF document text
    • https://vimiwegom.weebly.com/uploads/1/3/0/7/130775837/monodin_vikesopedawiw_mixumadakij_jekegaxizis.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/felasorarabipis/sojomiwotufosopaxadi.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/73513921129.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2246e71b-11b5-4c16-a7ba-3d24275779ce/28083351402.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18250da4-95dd-4f09-9601-7764f91da94b/96323235890.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/tamemamajenikuletipemad.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_off0000ee32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE32 5080 bytes
SHA-256: 0fe8de2bf58a19b1465ffb8070f50697009c7f5eb1bbc0b17170a7c77462d47d
font_01_sfnt_off0000ff8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8E 11180 bytes
SHA-256: 3b176aa5d751cf41d7a60c4585d05b010d01929f172050186f8402da097ddb1a

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