Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c3091ed0d4c46bf…

MALICIOUS

PDF

79.5 KB Created: 2021-04-08 22:40:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 31932cb0fd84b70cf8f50bf2b67e6796 SHA-1: e2ba61279f78c16bb3e5140a9998f1c459affce6 SHA-256: 2c3091ed0d4c46bf5d020af628644e9d26b239b57a3d6c0739561a4c0345ecfb
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the primary URLs, https://jottigo.ru/strik?utm_term=the+hobbit+art+book+tolkien, is likely part of this scheme. The document body is heavily obfuscated and unreadable, but the presence of numerous external links points towards a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/strik?utm_term=the+hobbit+art+book+tolkien PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366398/normal_5ff25c8c79caa.pdfIn PDF document text
    • https://tamoniwezetiro.weebly.com/uploads/1/3/5/9/135961995/tikosidajoxilale.pdfIn PDF document text
    • https://wisowoturap.weebly.com/uploads/1/3/1/4/131453432/a438376a264ca.pdfIn PDF document text
    • https://zaderoxuk.weebly.com/uploads/1/3/4/6/134694825/jixulirelozejamux.pdfIn PDF document text
    • https://vuloribogisoso.weebly.com/uploads/1/3/4/6/134655424/7873904.pdfIn PDF document text
    • https://jikumudepopojet.weebly.com/uploads/1/3/1/4/131453433/vafixo-kunoto-todafuxos.pdfIn PDF document text
    • https://bapamebitisetup.weebly.com/uploads/1/3/4/3/134325238/f383f3ac.pdfIn PDF document text
    • http://makedctl.site/the_lord_of_the_rings_the_return_of_the_king_video_game_pc_downloadpk0bv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495854/normal_6059772b9dd75.pdfIn PDF document text
    • http://lnstagramverifiedbadge-media.com/290005155543f5x6.pdfIn PDF document text
    • https://mokizafot.weebly.com/uploads/1/3/5/3/135347773/6899738.pdfIn PDF document text
    • https://kigijogi.weebly.com/uploads/1/3/4/7/134702755/varam.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/jolozidabi/medixexopesorejise.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/32376164008.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_off0000f86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86D 4748 bytes
SHA-256: 9a1901fcb331d44c5963fe9335dfe354f65fb45d3c630b4d003b3cb5fd162d07
font_01_sfnt_off00010885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10885 11968 bytes
SHA-256: d2f03db97f224a55fca15f77f6ad49e319f7d426ec24a78e938b878104c4e515

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