Malicious PDF — malware analysis report

Static analysis result for SHA-256 644b43ded6c6aa39…

MALICIOUS

PDF

73.1 KB Created: 2020-11-14 08:12:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 842d4478254c5a8abd6abc5aaff3aef0 SHA-1: 121b91597e7395c841d10bcb70ce0d0d9bee5107 SHA-256: 644b43ded6c6aa39fc85f1501882509b337aa207c13b97161ed3672855ea227e
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary external links, 'https://traffnew.ru/123?utm_term=moral+issues+in+business+pdf+free', is suspicious and likely leads to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

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://traffnew.ru/123?utm_term=moral+issues+in+business+pdf+free
    • https://cdn-cms.f-static.net/uploads/4409998/normal_5f9e651150147.pdf
    • https://cdn-cms.f-static.net/uploads/4388285/normal_5fa3006c23623.pdf
    • https://kidunaxu.weebly.com/uploads/1/3/1/4/131437100/xozozux.pdf
    • https://cdn-cms.f-static.net/uploads/4457332/normal_5fa9359217ad7.pdf
    • https://cdn-cms.f-static.net/uploads/4375708/normal_5f9cdc7b108e8.pdf
    • https://cdn-cms.f-static.net/uploads/4404966/normal_5f94fe9b22124.pdf
    • https://cdn-cms.f-static.net/uploads/4368964/normal_5f8a665f97167.pdf
    • https://finijuzado.weebly.com/uploads/1/3/4/4/134444754/gazigem-fifos-mamabedoxek.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/b32b5cba-1547-4263-8ecd-4bbf23163dd7/xumarenow.pdf
    • https://s3.amazonaws.com/memul/17859225335.pdf
    • https://s3.amazonaws.com/tedowafomaru/kapanivazibedozux.pdf
    • https://s3.amazonaws.com/kezemiradigu/descargar_libro_estadistica_descriptiva.pdf
    • https://s3.amazonaws.com/wenobagupexekap/sorelle_salon_camas.pdf
    • https://s3.amazonaws.com/vatosolikijike/49836033329.pdf
    • https://uploads.strikinglycdn.com/files/09c50113-50be-4afa-92a4-c9fd5a4cee6e/98969049452.pdf
    • https://s3.amazonaws.com/mijedusovineti/anambra_basin.pdf
    • https://s3.amazonaws.com/nonipesikiri/beep_song_my_kutty_web.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_off0000d779.bin
bd96e5b716daea7648b0f8324a8fef13c66b085dc3aaefcf23b662727e21e8b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD779 4984 bytes
font_01_sfnt_off0000e867.bin
f9c7050fc66e220d3cff8de1e03e36ea7e497f275c6787e727a69fee9f69d520		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE867 9660 bytes
font_02_sfnt_off0001096f.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1096F 4324 bytes

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