Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbcb8b77c0a42788…

MALICIOUS

PDF

65.8 KB Created: 2020-11-26 13:09:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 082d81fa25267a1cf8c502d373ed086d SHA-1: f9e0ac0cf2a63b985f3d3b3efb272770fe860a90 SHA-256: bbcb8b77c0a427883ef29aa95004ff1424299e251df90d6e31f938f3f5308896
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm or phishing infrastructure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior, and the presence of external URIs like 'https://trafficel.ru/strik?utm_term=google+sheets+round+down+to+nearest+5' indicates an attempt to redirect users to potentially harmful content.

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://trafficel.ru/strik?utm_term=google+sheets+round+down+to+nearest+5
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/wimukotuk-roted.pdf
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/4f51f5465.pdf
    • https://cdn-cms.f-static.net/uploads/4390323/normal_5f9630c8137b3.pdf
    • https://widubemevojapo.weebly.com/uploads/1/3/4/3/134320166/vilejaneroxak.pdf
    • https://fupexorugukemig.weebly.com/uploads/1/3/0/8/130814763/gomijik.pdf
    • https://nogafuku.weebly.com/uploads/1/3/2/8/132815296/6238932.pdf
    • https://cdn-cms.f-static.net/uploads/4388842/normal_5fb80fd0103d6.pdf
    • https://guvapokasek.weebly.com/uploads/1/3/4/4/134437462/c7d02.pdf
    • https://wubenigulusetib.weebly.com/uploads/1/3/4/7/134712949/kowutowezit-doninulujub.pdf
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/7872040.pdf
    • https://vapufubewadul.weebly.com/uploads/1/3/4/4/134485241/silitixenujame_letuxa.pdf
    • https://cdn-cms.f-static.net/uploads/4427095/normal_5fa899c04ad7e.pdf
    • https://cdn-cms.f-static.net/uploads/4383165/normal_5f95ad5d1fec7.pdf
    • https://cdn-cms.f-static.net/uploads/4367019/normal_5fa6b70356da4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sugaguxagu/jexatowutuwizumikozake.pdf
    • 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_off0000c3a8.bin
15231ae1bdf2eeba92727f724b3e48b579d0c158804e685566800904628ee59c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A8 5332 bytes
font_01_sfnt_off0000d5db.bin
d79eb63957c9b8815ce64773b6ff23ae49ffae7330dc1b37e54fdcb87f02361f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DB 10624 bytes

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