Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c6a238238022e54…

MALICIOUS

PDF

76.4 KB Created: 2021-02-22 21:02:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 92464070b30796cb2973f821eb60f2bf SHA-1: 7d159b96385abe401bc9e478e7dbdfbe3ab70e8f SHA-256: 5c6a238238022e5451255056de7e756cd24c12bb5bf70597f2fed239830d254b
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/strik?utm_term=is+batman+the+killing+joke+worth+watching PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367635/normal_601ad4ef7ca42.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381085/normal_5fec29a131d8f.pdfIn PDF document text
    • http://creditpm.com/riviera_theatre_showtimes_and_ticketsta32p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418558/normal_600c35393cba4.pdfIn PDF document text
    • https://kodabovoxalomas.weebly.com/uploads/1/3/5/3/135340354/c69b7b21cb33d18.pdfIn PDF document text
    • https://vemenujobife.weebly.com/uploads/1/3/5/3/135399872/141d8ebe39.pdfIn PDF document text
    • https://misapunuzure.weebly.com/uploads/1/3/1/6/131606411/1d08ff5.pdfIn PDF document text
    • http://macsk.space/24265550867sgiq9.pdfIn PDF document text
    • http://my-favshope.online/66983537364xcm6v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375344/normal_5ffb726727a73.pdfIn PDF document text
    • https://cdn.sqhk.co/rogudokives/e1hb4ji/35940173965.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408596/normal_60259aa26185e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368958/normal_602b6dc6ca9c0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3A 5312 bytes
SHA-256: d783bc71e8d64238798ace02e3f6ef91516fca1204775f97efb7179e4ed816b3
font_01_sfnt_off0000f023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF023 11124 bytes
SHA-256: 55d2c87561e2efce4b0fd21d43e4f76601acdbcca328e1cc06259a0621784701
font_02_sfnt_off0001160c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160C 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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