Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d5c12b98de08e7…

MALICIOUS

PDF

86.4 KB Created: 2021-01-04 03:09:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b5a033800924f424de5ef686554b6e72 SHA-1: b9cb1c55087482cf6f484aef1f8526ab28cb50c8 SHA-256: 50d5c12b98de08e7951ee5d6c145c9103bb8393c394912844c4c544a97405da8
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and external links are indicative of techniques used to redirect users to malicious sites.

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://traffnew.ru/123?utm_term=classic+warlock+guide+talents PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368777/normal_5ff247aec6125.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374185/normal_5f8fc16248f2f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369153/normal_5fe20602470d7.pdfIn PDF document text
    • https://lebotisoko.weebly.com/uploads/1/3/4/5/134597635/f5470f.pdfIn PDF document text
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/gakita.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/ac1b6f6bdde0b.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/jeIjgic/41574046561.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379054/normal_5f94a59572dab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454813/normal_5fa369fa3d4a0.pdfIn PDF document text
    • https://wefolukozik.weebly.com/uploads/1/3/1/4/131406413/gakemikuw.pdfIn PDF document text
    • https://lovarewido.weebly.com/uploads/1/3/4/3/134322716/vezoj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417039/normal_5fee8ef2b1c0b.pdfIn PDF document text
    • https://cdn.sqhk.co/guledijuxi/ZxgdiaL/voting_stats_for_2016_presidential_election.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387040/normal_5f9be09baa658.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/waxegatulo/5051331369.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/bevujexoxi.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_off0001169a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169A 5168 bytes
SHA-256: 817b5fe355cf4dfb9227da4ccbd67f1d8b1f1ea5ed320c8895e7ce9e06525ca6
font_01_sfnt_off0001284c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284C 10532 bytes
SHA-256: 6a796b3c7491f8f7ecf59e6b829d0429220e558822bde10ff249a79501820626

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