Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d6aceadd387810…

MALICIOUS

PDF

81.3 KB Created: 2021-03-02 21:36:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: ee92190ee83d8ae7f0ca1d04ac4f7092 SHA-1: 810df69e54ccf280126f67f68256f5d225b0cb88 SHA-256: 53d6aceadd387810953164e5cfbabd461fff8e2b4b4c5deb17610a5f64b43244
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs. The PDF_SEO_LINK_FARM heuristic indicates a mass of external PDF links, suggesting a primary purpose of directing users to other potentially malicious or SEO-manipulated content. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics suggest a phishing or content distribution vector.

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://vilenefex.ru/award?keyword=themes+in+heart+of+darkness PDF link annotation
    • https://cdn.sqhk.co/fabunavaxa/eZARhil/at_t_small_business_system_1070.pdfIn PDF document text
    • https://seruvukajobal.weebly.com/uploads/1/3/4/4/134479042/0f3cd5d998d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383923/normal_6004396e11e86.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462038/normal_6003c08d87c21.pdfIn PDF document text
    • https://jedexapotup.weebly.com/uploads/1/3/4/4/134472831/8145987.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369907/normal_600730957bd53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392441/normal_60210dab4f08f.pdfIn PDF document text
    • https://cdn.sqhk.co/mawebugo/aIOoDya/407599433.pdfIn PDF document text
    • https://cdn.sqhk.co/zivalutapa/IymngjH/tiny_archers_hack_download.pdfIn PDF document text
    • https://cdn.sqhk.co/merivexasug/qcig7gi/bricks_breaker_779.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451736/normal_5fcb8f1c96d4e.pdfIn PDF document text
    • https://cdn.sqhk.co/loxexafetivu/ijffhaO/40772251125.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388619/normal_602f447e68f29.pdfIn PDF document text
    • https://cdn.sqhk.co/luwokiseg/bjgrii5/renux.pdfIn PDF document text
    • https://tizevilujiv.weebly.com/uploads/1/3/1/4/131406709/420e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385004/normal_5fd16a9d96114.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452607/normal_6000301fb5525.pdfIn PDF document text
    • https://cdn.sqhk.co/wirowanorax/hgrhGgf/yellow_plastic_shopping_bags_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451555/normal_6035c1ed8c2bd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000103a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A7 5128 bytes
SHA-256: 8c3214bcb88a13ba47f4ab98503f538f55e73571caaded5f16130f9aba896537
font_01_sfnt_off000114eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EB 10332 bytes
SHA-256: 117ae9cc479948cbeb5016dbf5c3f31c991aa7296706bc664fc7327e214482cf

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