Malicious PDF — malware analysis report

Static analysis result for SHA-256 778abfac54d629e1…

MALICIOUS

PDF

72.8 KB Created: 2021-03-23 16:47:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc3a22fe5b51578ba85356bf715cd779 SHA-1: 96274abc9ca925beeb7dcb3a1c1eb1046d09362c SHA-256: 778abfac54d629e1bfa3d5813ab2d10989fdbdb5c98b277db335b88ee6fca533
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were extracted, the embedded URLs are the primary indicators of malicious activity, likely directing users to phishing or malware hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://nipisod.ru/strik?utm_term=what+is+another+word+for+progressives
    • http://famozosivupiwij.sportsontheweb.net/65755646950.pdf
    • http://tujidal.mypressonline.com/us_history_workbook.pdf
    • http://wanezus.scienceontheweb.net/tifotojujiwezuf.pdf
    • http://bumululoru.mywebcommunity.org/57729897427.pdf
    • http://janorewaxeno.mygamesonline.org/who_is_the_father_of_western_civilization.pdf
    • http://texoraw.sportsontheweb.net/winapuvutavaguxa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8e8ef6ac-913c-489f-8395-c30730e7ba0a.filesusr.com/ugd/f39c52_3daba4c2880c4e809ea863ed4d39c9dc.pdf?index=true
    • https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_34897af86c5a4979b36ba6242788384a.pdf?index=true
    • http://lawesiwewif.onlinewebshop.net/didozuduruzetewonolax.pdf
    • https://1160a196-6e18-49bd-931c-438029629b47.filesusr.com/ugd/40338c_7dad166df7a3483eaa3c463f00652495.pdf?index=true
    • https://s3.amazonaws.com/xifabilejilab/favolijunuvurerurogivajow.pdf
    • https://s3.amazonaws.com/davubewu/79446280115.pdf
    • https://s3.amazonaws.com/garorowa/95963998578.pdf
    • https://fae5df41-d68b-4d62-9961-cd33801cec7e.filesusr.com/ugd/f52c73_13db212ac8b64395871f95aa6bc12e36.pdf?index=true
    • https://b6f97e74-198a-461d-a312-d71b9712332b.filesusr.com/ugd/a2d007_6b67200bf41d41cc8784559eb124bb91.pdf?index=true
    • https://s3.amazonaws.com/rogugagatuf/mudukavaveri.pdf
    • https://s3.amazonaws.com/regovadeje/91291693136.pdf
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_930c0061da8c48a7994d0605532ddfd4.pdf?index=true
    • 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_off0000df2b.bin
89cb38f25b1b62114ea57fe638154bb5b2d6168b515340fbe09cfffaf2ecc1ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2B 5436 bytes
font_01_sfnt_off0000f1c4.bin
e0c1f92b71193948965211c5dbc1e07106f427c4761c9f7f2a45f8c953246967		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C4 10780 bytes

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