Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cfaece9dd991d10…

MALICIOUS

PDF

94.2 KB Created: 2021-02-27 20:50:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2a7a4badcb428db59b99efc00d3826c2 SHA-1: b5db05c61e5610729aef5e3cb7e85ca17930356c SHA-256: 4cfaece9dd991d1077aef23137bb673070dbb4eb86c476168caf6e3c2f0e13d3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many pointing to link farms on disposable hosting, suggesting an attempt to redirect users to malicious sites for phishing or malware delivery. Although no scripts were explicitly extracted, the presence of external URIs and the overall structure strongly indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://seumenha.ru/wix?keyword=fnaf+unblocked+download+weebly PDF link annotation
    • https://cdn.sqhk.co/tipefimex/ejiiibX/zokokutokuzuzisagabima.pdfIn PDF document text
    • http://xomunuxeju.sportsontheweb.net/3_point_perspective_drawing_step_by_step.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388620/normal_602441ba6400d.pdfIn PDF document text
    • http://momarivido.mypressonline.com/fawazujutafesup.pdfIn PDF document text
    • https://fimedezederuru.weebly.com/uploads/1/3/4/8/134884956/bd905c368c87.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4504870/normal_5ffecfad5922f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481825/normal_5fd14b49eb9cb.pdfIn PDF document text
    • https://lisumefi.weebly.com/uploads/1/3/1/4/131408082/638b1000f.pdfIn PDF document text
    • https://cdn.sqhk.co/zezegawutogu/ajhbjjn/14605473203.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415531/normal_600ef53104773.pdfIn PDF document text
    • https://barijimuje.weebly.com/uploads/1/3/1/4/131406344/9d14ca5cf1.pdfIn PDF document text
    • https://cdn.sqhk.co/duzoxibuf/hEBhdgf/tyrion_lannister_biological_father.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/boduxatavepe/97889607351.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_off0001344a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1344A 5092 bytes
SHA-256: 31206f1f5e7d38b8ae92b97aa6f0366457d8efccd95816ad01c9e49c1cc04373
font_01_sfnt_off000145d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145D2 11144 bytes
SHA-256: 912bb7f36848e57453db6331ee1aa9688bc0b3e45770cdc5fce6f3ec9a941bcc

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