Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d3bcdb6f3183001…

MALICIOUS

PDF

70.1 KB Created: 2021-01-31 23:03:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 545f78486eaf1bbe48081b07d1bbef2d SHA-1: 6fb53c59b726b437db03dc766b66586954cb7600 SHA-256: 3d3bcdb6f31830019033812dd22c17fa8bb6c9c48710564ecda645f4e6b4385e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with the heuristic 'PDF_SEO_LINK_FARM' indicating a large number of outbound links, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=what+is+facebook PDF link annotation
    • http://erogan-encolumbia.site/archimate_3.0_1ntj6d.pdfIn PDF document text
    • http://sentytld.online/spectacle_island_fallout_4_can_t_use_workshopsu4jq.pdfIn PDF document text
    • http://on-arenas.com/jusisizelagekesezunapcwmn6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473616/normal_5fe77cdc58397.pdfIn PDF document text
    • https://najovukuno.weebly.com/uploads/1/3/1/4/131453374/zelupiw-kewabe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447251/normal_5ffb85667a434.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/midizaxopazeji/pateniper.pdfIn PDF document text
    • http://kiwusumusi.rf.gd/76954705898.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/13675644570.pdfIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/daribojubutozotavimej.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/60426266538.pdfIn PDF document text
    • http://vapasiwivomod.epizy.com/51978496861.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_off0000d645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD645 5056 bytes
SHA-256: 418ac6320199e322b80b1e247581fdec401b948404d3bb1f8fa949d801d39ff7
font_01_sfnt_off0000e78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78F 10692 bytes
SHA-256: 0571f05f736ae1d53772fa7b7e92153bf35c10873535a408d0d36fac3ce30d3e

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