Malicious PDF — malware analysis report

Static analysis result for SHA-256 5197c43e5a3363a6…

MALICIOUS

PDF

66.7 KB Created: 2020-11-10 21:18:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 93a26916a87ae17d2194060e450e14f2 SHA-1: 17f960828af3959b34ced70fbd2e989f01cf3ab0 SHA-256: 5197c43e5a3363a66247b061584da0e72a2858e9b08587d8a310325b93ec51ef
244 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, containing numerous external links. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting an attempt to lead users to harmful sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?keyword=evil+quotes+from+macbeth In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372100/normal_5fa4617bd2e68.pdfIn PDF document text
    • https://xekurinesore.weebly.com/uploads/1/3/4/4/134478887/6061956.pdfIn PDF document text
    • https://nuwegojoda.weebly.com/uploads/1/3/4/6/134603756/d2f46f4.pdfIn PDF document text
    • https://fezuxikazosulav.weebly.com/uploads/1/3/1/3/131398093/bugoxanifun_rulik.pdfIn PDF document text
    • https://moguvikob.weebly.com/uploads/1/3/0/8/130874292/vitufimek.pdfIn PDF document text
    • https://tutofegabosig.weebly.com/uploads/1/3/4/7/134725810/671121.pdfIn PDF document text
    • https://texosubos.weebly.com/uploads/1/3/4/7/134715033/riluso.pdfIn PDF document text
    • https://pejopazuzaguwoz.weebly.com/uploads/1/3/2/8/132815183/fasuraruleze.pdfIn PDF document text
    • https://dajapofijakaf.weebly.com/uploads/1/3/4/2/134266914/1022176.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/regufojalojaza/vikusamudinekanovagaxovum.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/poxuveliragegexil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79bf55bf-00b4-4f25-beb5-feb4da15b620/3065775521.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_off0000c922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC922 5404 bytes
SHA-256: 6ab01c5f2d6347db076b890a9144a48756756792ffbeeca8cc09fddc351632d6
font_01_sfnt_off0000db67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB67 10356 bytes
SHA-256: f3998e69995e3ba6b8cec0e0a51865144726ffc872bac440cb2e7bdd66fceb9f

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