Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b4078b8d628c37e…

MALICIOUS

PDF

77.4 KB Created: 2021-03-01 14:34:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 75147206ee67e5fc7df318224c786ae4 SHA-1: 4cd0e170e102e5f49e86047dfc896cb5631690bf SHA-256: 6b4078b8d628c37e669abcb0c14c81eeab9be2526010f442fd7be88142837bbc
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a phishing or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of numerous external URLs points towards a potential download or redirection mechanism, possibly involving JavaScript within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=cadette+media+journey+ideas PDF link annotation
    • https://dujizajep.weebly.com/uploads/1/3/4/7/134704211/wijubux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411498/normal_60372ac5235c3.pdfIn PDF document text
    • https://cdn.sqhk.co/tebefaravuz/lgc9nZG/41541754876.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476566/normal_5fd9e4870f440.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413458/normal_5fc699a962d28.pdfIn PDF document text
    • https://mevavenepid.weebly.com/uploads/1/3/1/6/131637679/cdb77b195bff.pdfIn PDF document text
    • https://cdn.sqhk.co/xelalizogim/gUvciih/32356057276.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527164/normal_6021b9c9c151f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376870/normal_5fe85be773f2a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450424/normal_5fee3119a5503.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446016/normal_6002963e65800.pdfIn PDF document text
    • https://topudikuwem.weebly.com/uploads/1/3/4/0/134042537/botepojale.pdfIn PDF document text
    • https://zezonusadife.weebly.com/uploads/1/3/1/4/131410479/berediw-wivuzibelovata.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/dudujopixejikug/wapowuf.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/98123762571.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_off0000f5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BD 5024 bytes
SHA-256: b53bfd7c0fe58482cabfed54c6b91cee19bc15a9dfeb8fd7f61fb4499ef4077d
font_01_sfnt_off000106bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BF 10088 bytes
SHA-256: 67f6d34b40d19d247950edb7cb60fd5e3b44741e76ea16466a16b1e120505e8e

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