Malicious PDF — malware analysis report

Static analysis result for SHA-256 10f2a2034ebe9141…

MALICIOUS

PDF

70.9 KB Created: 2021-01-10 21:39:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67c144030ee6c06b62d54b125047e58f SHA-1: 758ab165e36d0f5b108e84d17b4ee149402c7757 SHA-256: 10f2a2034ebe91416a47864f4fa4e857738040d4b9d0e4cba465c62d55a30018
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate the document's primary function is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/123?utm_term=missionaries+and+the+religious+vacuum+summary
    • https://korodaziso.weebly.com/uploads/1/3/0/7/130740443/vezosoranewojibita.pdf
    • https://zinebogexorebo.weebly.com/uploads/1/3/1/4/131437984/dogeriw.pdf
    • https://lubebubekawi.weebly.com/uploads/1/3/4/7/134714091/takoronede.pdf
    • https://pufotawimudob.weebly.com/uploads/1/3/4/3/134380049/2248958.pdf
    • https://jezitazosebizag.weebly.com/uploads/1/3/4/7/134700096/taxadifupesafutom.pdf
    • https://duvinibekumexeg.weebly.com/uploads/1/3/4/6/134677329/d24a10ab07f.pdf
    • https://static.s123-cdn-static.com/uploads/4446931/normal_5fc4f7d800272.pdf
    • https://cdn-cms.f-static.net/uploads/4421474/normal_5fd2e6f8521b8.pdf
    • https://site-1213700.mozfiles.com/files/1213700/gitufaxiriji.pdf
    • https://wabelurotetef.weebly.com/uploads/1/3/4/6/134693048/bizizepanerinurop.pdf
    • https://kewojifusufiw.weebly.com/uploads/1/3/4/6/134662328/7b266b1.pdf
    • https://vikesuluwok.weebly.com/uploads/1/3/4/7/134763763/2df363ab92a68ad.pdf
    • https://cdn-cms.f-static.net/uploads/4406170/normal_5fac310914a8f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7be.bin
422147c7a73d0608a9de55e8a9fcce6abd6a41f0f294d182c00c6e8cd2196cf6
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BE 5520 bytes
font_01_sfnt_off0000ea74.bin
94bd74a2ad170d922955edd77530eeee2e9f075bca4e76ef492b17db48e6ba17
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA74 10880 bytes