Malicious PDF — malware analysis report

Static analysis result for SHA-256 0265635c4406b085…

MALICIOUS

PDF

75.3 KB Created: 2021-05-22 17:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: d04a3bab8d3bece6cd6d769b237b7b31 SHA-1: 425e0e287b45ef9a1e0673af2b560670a34f6788 SHA-256: 0265635c4406b085e658cdd2bf19939cf824237a6091d51523859ea0b840ed80
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDF files, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers flagged this as malicious, specifically as a phishing trojan. The embedded URL `https://jacksth.ru/strik?utm_term=riot+three+days+grace+lyrics+espa%25C3%25B1ol` suggests a potential phishing lure related to song lyrics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://jacksth.ru/strik?utm_term=riot+three+days+grace+lyrics+espa%25C3%25B1ol PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4490001/normal_5ff7aee85a2fc.pdfIn PDF document text
    • https://fuxarudoniw.weebly.com/uploads/1/3/5/3/135350341/41e1fe61f9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410975/normal_6062617796015.pdfIn PDF document text
    • https://rakulemiz.weebly.com/uploads/1/3/2/6/132682689/c398920d75fb35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387419/normal_606dde987eb30.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383579/normal_60039b3bcb82e.pdfIn PDF document text
    • https://fogebutozedelig.weebly.com/uploads/1/3/0/7/130776223/4664438.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447906/normal_5fcf33dd91589.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450355/normal_5ff0da4ec3dbf.pdfIn PDF document text
    • https://gilepijojuju.weebly.com/uploads/1/3/2/7/132740412/xijoserovo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387590/normal_60478a835d49e.pdfIn PDF document text
    • https://polopomix.weebly.com/uploads/1/3/4/8/134849819/e7345d83.pdfIn PDF document text
    • https://guvusogom.weebly.com/uploads/1/3/5/3/135324715/bugubi-dafimuzunademo-fezikoga-jomigozete.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365525/normal_60468d34cb512.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369663/normal_5fda8f862398b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450251/normal_600ca3b87aa2f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449779/normal_5fcf678a0c8c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476765/normal_5fcf2c7256bb3.pdfIn PDF document text
    • https://waxogisuges.weebly.com/uploads/1/3/0/7/130776632/fc99b3adbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458631/normal_604c982a43c6a.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/fomaralunex/tuzarubobomipeti.pdfIn PDF document text
    • https://s3.amazonaws.com/nojemi/duwamish_river_fishing_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/african_traditional_religion.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_off0000e0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B6 5656 bytes
SHA-256: 4046434e1c6d9a6025ca07227d55b5b1bc45caae85f27e70082bb5b1fc2d868f
font_01_sfnt_off0000f3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BA 13256 bytes
SHA-256: 6ffc8497c8a82668232aef1bc69ce4f019ee59662496409922417bf0371a56b1