Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0dee8f8d634c765…

MALICIOUS

PDF

67.5 KB Created: 2020-12-20 02:51:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 660e060aa2791f39cddec8801fc1d182 SHA-1: 9ea85c597788a6d3a5c609a0c3d485385bbef4fd SHA-256: c0dee8f8d634c765e750f5688cdb9efb2bb47d8fac3ca335cb581c401aadea53
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, with a significant number pointing to disposable hosting services, suggesting an attempt to redirect users to potentially harmful content. The presence of embedded URLs and the overall structure strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffset.ru/strik?utm_term=picture+communication+symbols+free+online PDF link annotation
    • https://gesinanafu.weebly.com/uploads/1/3/4/4/134481382/tulotaxanozil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471250/normal_5fa8839da2de2.pdfIn PDF document text
    • https://vaturelola.weebly.com/uploads/1/3/4/7/134704713/pizunagekoxelur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426090/normal_5fa3a9312eaa1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414175/normal_5fc590d817b9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469143/normal_5fba75290c107.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368486/normal_5f88237a85d54.pdfIn PDF document text
    • https://nudaduxovusupin.weebly.com/uploads/1/3/4/3/134337963/2323922.pdfIn PDF document text
    • https://kivuligob.weebly.com/uploads/1/3/0/8/130874143/493983.pdfIn PDF document text
    • https://wukelefitifaka.weebly.com/uploads/1/3/4/8/134882985/puxijunileb_vobugo_jabar.pdfIn PDF document text
    • https://mefupajudeto.weebly.com/uploads/1/3/4/8/134883840/semogakix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378853/normal_5fd893e58dedb.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/latufenaw/best_form_fillable_5e_character_sheet.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_off0000c8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DB 5268 bytes
SHA-256: 17006cff3a02b5ab0b116a7c93524188d9284b292f34c9db52bfc3e0dec4128c
font_01_sfnt_off0000daba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABA 10768 bytes
SHA-256: 293858680449e6837620ef54a121944746d181cb62d8b10f90db60c44cda13c3

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