Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbd1a6ed8bb5800e…

MALICIOUS

PDF

67.7 KB Created: 2021-02-14 13:53:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4d86a547e788a71d6dbe8be4d8a7aaeb SHA-1: 2249a502889260a392e64725d698d129dda1306e SHA-256: cbd1a6ed8bb5800e2b95a1caad45bf3136bbce132296faab83e6900cbaa6ae29
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicative of a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

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://seumenha.ru/wix?keyword=mario+camarena+instagram PDF link annotation
    • http://goshop32.site/talavozizatotunw2381.pdfIn PDF document text
    • https://dotowukigirer.weebly.com/uploads/1/3/1/1/131163902/5768322.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426543/normal_5fd1378d45617.pdfIn PDF document text
    • http://itanto.space/wukiz3wc6e.pdfIn PDF document text
    • https://fovezifume.weebly.com/uploads/1/3/0/8/130874198/d1775865a0f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496360/normal_5fdeffb04a339.pdfIn PDF document text
    • http://vquest.website/mode_emploi_telecommande_free0w04t.pdfIn PDF document text
    • https://jekufagiz.weebly.com/uploads/1/3/0/7/130739150/buwivivinanu_zanorekoxokad_telajuvefinif.pdfIn PDF document text
    • https://denuxikunoleluj.weebly.com/uploads/1/3/4/0/134018299/manowujofu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501374/normal_5ff90e2584ec9.pdfIn PDF document text
    • http://zubiki.top/117950741539n5mb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366327/normal_5fdef956c45dc.pdfIn PDF document text
    • https://kedumapeba.weebly.com/uploads/1/3/4/5/134593926/renaz-lefejodadogepab-rovazen-pejidumitog.pdfIn PDF document text
    • https://ferutijuze.weebly.com/uploads/1/3/1/8/131856408/0a069.pdfIn PDF document text
    • https://nirotagikul.weebly.com/uploads/1/3/5/9/135992947/rimed.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/goviwigax/senerakerifarumax.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_off0000ce4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4F 5092 bytes
SHA-256: 7926967b4b4b29b37deb4aad2ace9ec2dc1c11a3c474c704f8cb2d1b32d00cd5
font_01_sfnt_off0000df95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF95 10080 bytes
SHA-256: 6219ff2cc7e5bf470ba9af37336e02a76f69c0f307957b3ec2203781fd895dde

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