Malicious PDF — malware analysis report

Static analysis result for SHA-256 8642269a4d45a0d6…

MALICIOUS

PDF

75.7 KB Created: 2021-02-02 15:09:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 11b882d0ca9579d14a0b1763faa48db6 SHA-1: a28bfd2e42ee12a299f0b3dfef8664cd27205517 SHA-256: 8642269a4d45a0d66722252fdd2ebcffd6a14b09c9c2c6755e1973aa910cc4bc
126 Risk Score

Malware Insights

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

The PDF contains multiple external URLs, with one specifically linked to a lure related to 'Elite dangerous alliance chieftain'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for numerous links, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the redirection of users to malicious sites.

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 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/123?utm_term=elite+dangerous+alliance+chieftain PDF link annotation
    • https://wugexufaferefe.weebly.com/uploads/1/3/0/7/130776446/gelewugivi.pdfIn PDF document text
    • https://bugasidajuw.weebly.com/uploads/1/3/1/8/131856032/ae9ef0e0753f7e.pdfIn PDF document text
    • https://guditeni.weebly.com/uploads/1/3/4/5/134529862/bosuwelizavizonof.pdfIn PDF document text
    • https://cdn.sqhk.co/rokatodupi/hdiinZc/fapexunizolazosuga.pdfIn PDF document text
    • http://stonersfranchise.com/mario_kart_retrogames._czwoqwq.pdfIn PDF document text
    • http://wgathering.org/43360665193blkx5.pdfIn PDF document text
    • https://bapefakujina.weebly.com/uploads/1/3/4/4/134483882/fofofelu.pdfIn PDF document text
    • http://tertov.xyz/781451207946u6wq.pdfIn PDF document text
    • http://alania365.ru/73313920226f12v8.pdfIn PDF document text
    • https://cdn.sqhk.co/sojowidaz/7jeibhf/todolist_abstractspoon_linux.pdfIn PDF document text
    • https://cdn.sqhk.co/jowapezo/QgniiYH/free_bubble_shooter_3.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/laginekux/6986829255.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/12068627913.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/25640968194.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_off0000e869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE869 5240 bytes
SHA-256: a000def86f776a80c1c028931748c1784805b6cdb202cf17e511b1e8a6887c7a
font_01_sfnt_off0000fa3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3C 12020 bytes
SHA-256: ce78c0ad46a333f001caf53670984526730cd4d38a3712e0c6dd4452c876a74f

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