Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a703dee6d65d656…

MALICIOUS

PDF

78.5 KB Created: 2021-06-14 04:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed7ff3c65c8061edf7b663f6fcd7c195 SHA-1: eddfd69ec21bee931dd575c9df7c9a8f149f35c3 SHA-256: 5a703dee6d65d6567ebf8a85a15874349bf688ca727ea708e7a41a6cf8f68517
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to potentially malicious websites, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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://archism.ru/pbw?utm_term=stranger+video+chat+site
    • https://zakesulukagog.weebly.com/uploads/1/3/4/4/134493448/patowukijawomexuxi.pdf
    • https://wepujemu.weebly.com/uploads/1/3/1/4/131453456/ec8aa24d7.pdf
    • https://norigawe.weebly.com/uploads/1/3/3/9/133988483/8080887.pdf
    • https://bujapuvewujik.weebly.com/uploads/1/3/4/7/134702992/noziraterafefasugazo.pdf
    • https://zabifotip.weebly.com/uploads/1/3/7/5/137520114/3355274.pdf
    • https://cdn-cms.f-static.net/uploads/4383929/normal_60170dd8293d6.pdf
    • https://cdn-cms.f-static.net/uploads/4474445/normal_60535df6c1a2e.pdf
    • https://nixejovebomir.weebly.com/uploads/1/3/1/3/131380485/luzarisoxakudo-romunifikuda-zavegufad-gasiji.pdf
    • https://cdn-cms.f-static.net/uploads/4402944/normal_606922a9765cd.pdf
    • https://cdn-cms.f-static.net/uploads/4454179/normal_6031e97006448.pdf
    • https://dagagiketilijo.weebly.com/uploads/1/3/4/3/134312633/sukamo_gazuludewuku_sulagowebux.pdf
    • https://cdn-cms.f-static.net/uploads/4377408/normal_6025b26c3bdd6.pdf
    • https://cdn-cms.f-static.net/uploads/4392452/normal_6026075b3dafc.pdf
    • https://cdn-cms.f-static.net/uploads/4420589/normal_60c23c983d895.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e578c535-a924-4f62-93ea-bf43cd9a0dc8/que_medios_de_comunicacion_existen_en_mexico.pdf
    • https://uploads.strikinglycdn.com/files/6b17e875-ac57-432f-a051-24900d0fcc94/96929619671.pdf
    • https://uploads.strikinglycdn.com/files/faffa471-560e-4d25-b693-3eba3d419495/nipib.pdf
    • https://uploads.strikinglycdn.com/files/f3fe5a4d-a2db-4326-b2e4-4745bae4c3d2/gowemuriwazixuwal.pdf
    • https://uploads.strikinglycdn.com/files/62d7be1d-8e75-48fc-9669-4f74cdecccc0/9447985140.pdf
    • https://uploads.strikinglycdn.com/files/fceb7ad4-2327-4e7d-8905-bfec2d01ccf2/super_mario_all_stars__super_mario_world_emulator_online.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_off0000f4b5.bin
bee0a1da3b252e9db29313c22ff2c0a29df25dc076ea7d1904fbd7db7998dc5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B5 5332 bytes
font_01_sfnt_off000106d8.bin
8b47a5938231e23e1327bbe37995fc6db927f3e423bcb9580b5e04b7c40061e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106D8 11144 bytes

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