Malicious PDF — malware analysis report

Static analysis result for SHA-256 d027dcda0c923e05…

MALICIOUS

PDF

87.9 KB Created: 2021-05-27 06:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba0bf8c9d900c3d42023de654c15fc29 SHA-1: ba582b1589670e029311d0045e7884b08ff414bd SHA-256: d027dcda0c923e055307017fdf5a6f161ed8efd98a6b6665dcf795534cc598c6
156 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 phishing or trojan threat. It contains a large number of external links, suggesting a link farm or SEO manipulation tactic. The primary external URL observed is vilenefex.ru, which is likely part of the malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/strik?utm_term=skyrim+skuldafn+temple+puzzle+1+answer
    • https://static.s123-cdn-static.com/uploads/4447086/normal_5fcd09961baf3.pdf
    • https://cdn-cms.f-static.net/uploads/4472793/normal_601241e59731b.pdf
    • https://cdn-cms.f-static.net/uploads/4490371/normal_6017103a5105f.pdf
    • https://static.s123-cdn-static.com/uploads/4379968/normal_5fffb88f78f6e.pdf
    • https://cdn-cms.f-static.net/uploads/4466370/normal_60555e9f759aa.pdf
    • https://kowedanu.weebly.com/uploads/1/3/4/6/134687265/kokudotebovusijoge.pdf
    • https://cdn-cms.f-static.net/uploads/4488810/normal_60379cc7406f4.pdf
    • https://xisuludibu.weebly.com/uploads/1/3/5/3/135300694/wujamoxilebel.pdf
    • https://vesovagesigopek.weebly.com/uploads/1/3/4/6/134614223/0de3dfeb.pdf
    • https://static.s123-cdn-static.com/uploads/4454436/normal_5fe020efc89e7.pdf
    • https://ronawidafaleso.weebly.com/uploads/1/3/4/5/134504313/2698977.pdf
    • https://cdn-cms.f-static.net/uploads/4366017/normal_605fd2204e4e8.pdf
    • https://tevunuxewime.weebly.com/uploads/1/3/1/4/131452804/7785042.pdf
    • https://cdn-cms.f-static.net/uploads/4388285/normal_5fdc89eeb7cd5.pdf
    • https://cdn-cms.f-static.net/uploads/4371244/normal_603a1fa2a1a14.pdf
    • https://static.s123-cdn-static.com/uploads/4420222/normal_5fdfb4a7c55bd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bddca99e-8a1b-4e0c-9ce2-19961a351667/gafidariravafogemeduvi.pdf
    • https://uploads.strikinglycdn.com/files/1e9ad1ef-ed6d-476d-907a-e27807673d33/kituwimekumu.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010241.bin
1f22198febc391f487336fd35f4ad2a9e91175e26f905e5f5f1c1b50676a3f70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10241 5648 bytes
font_01_sfnt_off0001158c.bin
d526354a1360c9e350dd54df543bc766f2056406ce07d6e2fd4313af08444a6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1158C 10912 bytes
font_02_sfnt_off00013ae7.bin
536551dee6876366cf8a5d925709f0aaa9c9f58e9963f4e154d0e8cf77de6ee3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE7 16196 bytes

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