Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc060efed67fca4…

MALICIOUS

PDF

71.5 KB Created: 2021-02-21 21:54:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 52785fd92f00356dd8b100b64adfbbd1 SHA-1: 1f3c44019117856bfaade276b9af218d34eca507 SHA-256: 8dc060efed67fca4d49fd442070763908091d005c7744f69b819d94b2915cf16
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 malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm point towards a malicious document designed to redirect users to potentially harmful sites.

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://maypoin.ru/strik?utm_term=hult+international+business+school+tuition+mba PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4474992/normal_5ff7642a1d40d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415304/normal_5fc9ab505e67f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404103/normal_5ff157a79e677.pdfIn PDF document text
    • https://nosevale.weebly.com/uploads/1/3/2/6/132683459/tifebo.pdfIn PDF document text
    • http://tukazijib.22web.org/12758988865.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450864/normal_5fcf18c2ee93b.pdfIn PDF document text
    • http://dipurenirexo.22web.org/divorigegajubafoxojakiva.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475197/normal_5fcc2741d3b1f.pdfIn PDF document text
    • https://cdn.sqhk.co/famazipow/qifhicl/cross_the_bridge_when_you_are_there.pdfIn PDF document text
    • https://cdn.sqhk.co/roretuduva/hclbWjj/mavubibefexepevina.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/U7gehjc/mixoxusu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484156/normal_602886ef4a54c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484363/normal_6015b90ef03e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368494/normal_5fca87fb635fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368222/normal_5ffe4650d9fb5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kagumabexa.rf.gd/22091414808.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_off0000db10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB10 5140 bytes
SHA-256: b558504901e998836e518f663c86edfcc451e99c93f0544d8db63d843e2efaac
font_01_sfnt_off0000ec5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5B 11000 bytes
SHA-256: 0d529df97643ca6fdee98878350c1b5a94296fc583a0144fdf479ab4d54d9647

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