Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b684d276d2ad78…

MALICIOUS

PDF

62.8 KB Created: 2020-11-14 14:58:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5dbc2eedc4688f5a4cfe8f38e93f8376 SHA-1: 9617b3c16d38187a5313cc0227ed07b04f772acf SHA-256: d5b684d276d2ad782afe8e0a1dd27362d8b3b9183d64ecd65ac9dae2dc6dad57
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, with a primary one pointing to 'traffset.ru', suggesting it functions as a link farm to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a deliberate structure to host many links on disposable domains. No scripts were extracted, but the presence of external URIs and the link farm nature strongly suggest a malicious intent to redirect users.

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://traffset.ru/strik?utm_term=yenilmez+izle+t%25C3%25BCrk%25C3%25A7e+dublaj
    • https://cdn-cms.f-static.net/uploads/4387919/normal_5f90f38b4265d.pdf
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/siwivexibajerox-xukiwip-larebefiwosuf-valanobakebik.pdf
    • https://zafozudakajadev.weebly.com/uploads/1/3/0/8/130814863/b628c54eef4e3.pdf
    • https://vafumigoku.weebly.com/uploads/1/3/1/3/131384305/9811421.pdf
    • https://rulomegujenuguv.weebly.com/uploads/1/3/4/3/134329868/2698682.pdf
    • https://sisaseno.weebly.com/uploads/1/3/0/7/130776680/3755317.pdf
    • https://vapufubewadul.weebly.com/uploads/1/3/4/4/134485241/gesojevagemolu.pdf
    • https://risimapi.weebly.com/uploads/1/3/4/3/134321435/f7d2aae.pdf
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/56c4742ffb2635.pdf
    • https://cdn-cms.f-static.net/uploads/4366007/normal_5f87b492b5a1c.pdf
    • https://cdn-cms.f-static.net/uploads/4477623/normal_5fa5baa093069.pdf
    • https://cdn-cms.f-static.net/uploads/4418188/normal_5f99c97b8e724.pdf
    • https://cdn-cms.f-static.net/uploads/4369917/normal_5fa6dbbec066a.pdf
    • https://cdn-cms.f-static.net/uploads/4401976/normal_5f9e6bccf0bc4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/gajabedafot/47692057979.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ab8e.bin
8f2bd88c7b859ffd5d297654f34f670574786dc5fd0efd026e2ff70f2e9d17c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB8E 5156 bytes
font_01_sfnt_off0000bcc9.bin
66bfa1ce7fca18b98d79596814df6fca8c0264e3381337b907ebbec7220da984		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC9 10560 bytes
font_02_sfnt_off0000de67.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE67 4324 bytes

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