Malicious PDF — malware analysis report

Static analysis result for SHA-256 35c5150d19e0ae44…

MALICIOUS

PDF

84.3 KB Created: 2021-02-28 19:09:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8dd7dcab771eb8b0b2e271fd4a45bfbf SHA-1: 2c8fd321c7740444c0dcf99200ce7748ad59b7c6 SHA-256: 35c5150d19e0ae44096723f21e42419163d971fff142ebc2d44790b3dad78f97
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URIs, with at least one pointing to a suspicious domain ('fokemale.ru') that appears to be part of a link farm designed to redirect users. The presence of multiple external links suggests an attempt to direct users to potentially harmful content or phishing pages.

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 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://fokemale.ru/strik?utm_term=continuidad+de+los+parques+analisis+titulo PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370989/normal_6016e8e833cfd.pdfIn PDF document text
    • https://cdn.sqhk.co/pasepizut/aGjiifN/bariwofo.pdfIn PDF document text
    • https://viwosakizipisot.weebly.com/uploads/1/3/5/3/135321869/mubuvibon-porizerubikuve-ratumegez.pdfIn PDF document text
    • https://junobinedutuki.weebly.com/uploads/1/3/2/7/132712306/6845164.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414695/normal_5fd7f891e058c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379971/normal_603127290baa7.pdfIn PDF document text
    • https://vajinivokesele.weebly.com/uploads/1/3/5/3/135326698/lupezomatefaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484358/normal_5fdf13cd2d5cf.pdfIn PDF document text
    • https://ragaxunuwad.weebly.com/uploads/1/3/1/4/131407405/5414279.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464529/normal_6014dda5d5c00.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390642/normal_5fc7cc7ad2aa6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501634/normal_600d069fa9905.pdfIn PDF document text
    • http://dipenoguzel.sportsontheweb.net/how_to_jump_start_2008_ford_escape_hybrid.pdfIn PDF document text
    • http://levotavo.scienceontheweb.net/84529314373.pdfIn PDF document text
    • https://devatokur.weebly.com/uploads/1/3/2/6/132683056/3495d9387f1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jabodegodonirad.atwebpages.com/zixodafudulirufisozina.pdfIn PDF document text
    • http://peledopa.myartsonline.com/fadudidegezawina.pdfIn PDF document text
    • http://pikubub.onlinewebshop.net/zojubimapeduvexobajem.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_off00010c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C22 4984 bytes
SHA-256: d0c9cbe267ac1492930bda9c7b412a032843107b530378d1aa51de0e37cf4d95
font_01_sfnt_off00011d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1D 11448 bytes
SHA-256: 9c81c74184e86c6ede80d509a1ee90b881dcce16323be947bf67429a67bc0217

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