Malicious PDF — malware analysis report

Static analysis result for SHA-256 a18ae05c153f2d3c…

MALICIOUS

PDF

95.0 KB Created: 2021-03-20 00:48:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c46a9b20f5a5b44262b0f0454ac24350 SHA-1: bf19469372eba621ae9c75fab89ac9b9e23a811f SHA-256: a18ae05c153f2d3c9d6ffd433608b308f37201c179bc53d6fda90231dc1aa299
164 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical finding for a large number of external PDF links, suggesting a link farm or malicious content distribution. ClamAV also detected it as a phishing trojan. While no scripts were extracted, the presence of numerous external links, some with suspicious-looking paths, indicates a potential attempt to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jumiwimov.ru/strik?utm_term=kingkiller+chronicles+books
    • http://verenica.net/football_manager_handheld_2010_psp_cheatsfnt4g.pdf
    • http://4kuhd.me/29120208923sw5l0.pdf
    • https://cdn-cms.f-static.net/uploads/4529697/normal_5fd9a585b068a.pdf
    • https://static.s123-cdn-static.com/uploads/4374857/normal_5ffaa62ed367c.pdf
    • https://cdn-cms.f-static.net/uploads/4403140/normal_6041f74ddf5eb.pdf
    • https://static.s123-cdn-static.com/uploads/4450864/normal_5fee32fe91257.pdf
    • https://cdn-cms.f-static.net/uploads/4369927/normal_600d8b884d8c7.pdf
    • https://cdn.sqhk.co/pumibavi/Y0qigx7/latinetumodogerudewef.pdf
    • https://cdn-cms.f-static.net/uploads/4373527/normal_603eae2b5a6f6.pdf
    • http://lnstagram-badge-verification.com/internal_carotid_stenosis_treatment_guidelineseyjhd.pdf
    • http://my-favshopd.online/swedish_flag_emoji_androide6okb.pdf
    • https://static.s123-cdn-static.com/uploads/4384828/normal_5fef9e24cca5d.pdf
    • http://edarudost.online/caste_validity_certificatep84n3.pdf
    • https://cdn.sqhk.co/zipirevofu/gXicgfB/43869546710.pdf
    • http://ita-talia.fun/lezokekejn56h.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://69b3109a-7cce-4514-9193-d2106d9976ab.filesusr.com/ugd/3c2969_787cfa4bbba54c91953fdf582f7a86a1.pdf?index=true
    • https://29ce6865-365c-47c4-9f0a-635d6f965865.filesusr.com/ugd/0d6b77_b84de7fbecf64590b1cebdf3aee3fc87.pdf?index=true
    • https://09ec9d85-9312-4337-94d0-b84080e05f2e.filesusr.com/ugd/ac0094_d5386a5bba7044e5bb68b6847cace5ba.pdf?index=true
    • https://460eb545-5389-4aa9-9e78-d1074a8bca0c.filesusr.com/ugd/21a131_1636fc932d00435aa17cdbccf7b1c012.pdf?index=true
    • 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_off000138fc.bin
bc4288bb8001a93c1956e116f9a11233e68a74bb589b20d408d5d4aefaff9e28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138FC 5024 bytes
font_01_sfnt_off00014a1b.bin
59f84766bc8e54ccb355587afebdc079638452cf28ab37584d3a3dbd12ec7347		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A1B 10840 bytes

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