Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec3d20fff59c61d1…

MALICIOUS

PDF

76.4 KB Created: 2021-02-26 11:45:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 45f524bfeeb7900ca152c5bf32212232 SHA-1: 7f326a65eb333622303ffdc513b3cfc45dc2e406 SHA-256: ec3d20fff59c61d15555f7ca37a3407fd5d13340c6555da293f8007a6de2394c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which appear to be SEO-optimized to mimic educational content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and extensive URI usage suggest it's designed to redirect users to malicious 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://vilenefex.ru/123?utm_term=ncert+political+science+book+class+9+chapter+3 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4482023/normal_602a054587950.pdfIn PDF document text
    • https://mubasaji.weebly.com/uploads/1/3/4/8/134846322/4503095.pdfIn PDF document text
    • https://linebabeta.weebly.com/uploads/1/3/5/3/135317009/b3ca129dc203541.pdfIn PDF document text
    • https://cdn.sqhk.co/balaragu/jcgjjdJ/degerofenidivisoxexuwot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416144/normal_5fd95873d0a68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500887/normal_5fe64ce9e63f9.pdfIn PDF document text
    • https://cdn.sqhk.co/nodujugebi/iczijjf/37266041668.pdfIn PDF document text
    • http://golixudib.mypressonline.com/heat_and_mass_transfer_fundamentals_and_applications_6th_edition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416318/normal_600d79cbae61d.pdfIn PDF document text
    • https://cdn.sqhk.co/tofegejij/agifFjb/darkovibes_wish_me_luck_lyrics.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495843/normal_60098f6cb4621.pdfIn PDF document text
    • https://nojabepeteguki.weebly.com/uploads/1/3/4/6/134669956/6921898.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371786/normal_6017897899ea8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496381/normal_6030095e1877f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ed0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0A 5512 bytes
SHA-256: b3172ccef9853771935ede88f73c7475f93319a9c34db6e62130b09993a790f4
font_01_sfnt_off0000ffba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBA 10692 bytes
SHA-256: f73e80c7da8db91b6cc40c7fbb16f5a9cd42a5e097178b1016e07643f87164f2

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