Malicious PDF — malware analysis report

Static analysis result for SHA-256 5506a4de2cb652d6…

MALICIOUS

PDF

82.9 KB Created: 2021-03-11 04:16:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: a8df255c090c4338caf6f33ecc6fb78a SHA-1: 870f0ef0273e333553c889393e655d5a5a9a5638 SHA-256: 5506a4de2cb652d6426511c0ddb4f9f9350b2503aac8e3ee1191c2e91fe590a2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as a malicious PDF by multiple heuristics, including a critical ClamAV detection and an ML classifier. The PDF contains numerous embedded URLs, with a primary one pointing to 'vilenefex.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains keywords related to 'Cbse examination bye laws', indicating a lure to trick users into opening the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9473

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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/award?keyword=cbse+examination+bye+laws+2020+20+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4482870/normal_602d53fbbe078.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489725/normal_5fd2f9c9de5de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383791/normal_5ffabd3d21faf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402948/normal_5fe0bcb4ef7d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382793/normal_6035f0977dc0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490371/normal_6044942bb7fe7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447669/normal_5fe9e54eedf1a.pdfIn PDF document text
    • http://mifvideo.space/zotekoxitosabipifaxdos.pdfIn PDF document text
    • http://milansit.space/57403919580j8m3m.pdfIn PDF document text
    • http://idealicaufficiale.website/70660891396vmfjt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372384/normal_5fc87eea8772c.pdfIn PDF document text
    • http://submonster.xyz/kunatexakg14qw.pdfIn PDF document text
    • https://pasezarovatif.weebly.com/uploads/1/3/4/8/134858127/4754487.pdfIn PDF document text
    • https://tuduzijusesuzi.weebly.com/uploads/1/3/1/4/131406801/mabelefufi_tuwirobewi_kovizezuj.pdfIn PDF document text
    • https://busejupeguwija.weebly.com/uploads/1/3/0/7/130740624/pixuz_bekuduxumobu_fukepisuwomiwep.pdfIn PDF document text
    • http://gouliwer.online/46477209009qwopa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7893bdd6-41e4-48f6-9953-3a636dfb5d61.filesusr.com/ugd/c5c63b_b6b22e1bd7114d43adbc408f71fd43f3.pdf?index=trueIn PDF document text
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_55b8f7a18004401a9975171c2894ff88.pdf?index=trueIn PDF document text
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_f997a6ac6bc3496db2a2e30ee3d198fa.pdf?index=trueIn 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_off000113a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A9 5672 bytes
SHA-256: aaf3b7bb3de6ecea7bc3f2fbdae3994bc9f0873d0616a56a9aaf36ced130b4dd
font_01_sfnt_off000126ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FF 10636 bytes
SHA-256: 3130c9788fdcf93157aca43f0ec8a7461cf1fd9d9198a3a2d79f16cd3d10ba66

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