Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c755ff22cb35276…

MALICIOUS

PDF

97.5 KB Created: 2021-02-25 06:07:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 45fe6b34af72e87dd8077accec0921ec SHA-1: d900803b8c6f9b6c30c35cc451b9ffde0b2f69c4 SHA-256: 1c755ff22cb3527679c7e799e838a450b38024ee550a07309947bd4b127b46ba
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains a title related to bread making, which is likely a lure to disguise the malicious nature of the links.

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://seumenha.ru/123?utm_term=can+you+make+gluten+free+bread+in+any+bread+maker PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470835/normal_5fd63f4030dc5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426409/normal_5fe18a28b4be4.pdfIn PDF document text
    • https://cdn.sqhk.co/bapuwanuvadi/f7HUN6w/12149052272.pdfIn PDF document text
    • https://funofumid.weebly.com/uploads/1/3/4/8/134886651/zubijun-wiwegigek-jutirevuf.pdfIn PDF document text
    • https://cdn.sqhk.co/jopubelo/kBjdCij/animatic_by_inkboard_app.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481830/normal_6000762db5209.pdfIn PDF document text
    • https://mafupalitofix.weebly.com/uploads/1/3/4/0/134042392/4704142.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464072/normal_5fe284c0d0af7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368964/normal_601f0f2e9962c.pdfIn PDF document text
    • https://cdn.sqhk.co/supajoni/iagjyjh/9586578443.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwozavenu/jiginhg/12595126792.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476268/normal_5ffe27c40b93b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376098/normal_5fda3e44da29c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425227/normal_6013140d7668c.pdfIn PDF document text
    • https://cdn.sqhk.co/loganidob/hjd9Pjc/purixeludoxozodat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sogivuwe.onlinewebshop.net/roxabexedul.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB4 5260 bytes
SHA-256: 49fd029d329ed69a51c590cdc0bb197418ca72cb69914e37c62bfb56e4d48118
font_01_sfnt_off00014196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14196 12112 bytes
SHA-256: d40125d1c56392114c1a482746c2c53b0fb321ef99288dd0d512385c35cff4c2
font_02_sfnt_off00016a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A2C 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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