Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d4604d216f613e3…

MALICIOUS

PDF

82.1 KB Created: 2021-04-04 14:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 69f2fa51e46491ad0f512f36c314ca7a SHA-1: 0857cc37c055d7e126c6b3d08038680449ac57f9 SHA-256: 6d4604d216f613e3cf32ec00ab51e3d06b64a06faf9587101f1815362c9d3294
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO poisoning or distributing malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and extensive link farm suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/award?keyword=ielts+writing+band+7+sample+pdf
    • https://vegimeva.weebly.com/uploads/1/3/1/3/131380995/ef66ff1fa.pdf
    • https://fanuterose.weebly.com/uploads/1/3/3/9/133999321/2cf5f1f8.pdf
    • https://jipunelokafup.weebly.com/uploads/1/3/4/1/134109215/8789df5f48a3.pdf
    • https://fenolipemul.weebly.com/uploads/1/3/4/3/134341818/5807150.pdf
    • http://vumamanepu.sportsontheweb.net/axiom_set_theory.pdf
    • https://senabexe.weebly.com/uploads/1/3/4/2/134265557/8d735a4d00e2be.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://monejorudazan.epizy.com/que_es_psicologia_general.pdf
    • https://s3.amazonaws.com/ninazarila/jimakazadujidijedojonawe.pdf
    • http://xorabaza.rf.gd/31048484879.pdf
    • http://mewadabapubato.rf.gd/fakajatipaji.pdf
    • https://s3.amazonaws.com/pazatuv/orbit_sprinkler_timer_not_starting.pdf
    • http://gurunetotej.rf.gd/37484915171.pdf
    • http://sajoveguduv.onlinewebshop.net/income_tax_amendments_for_fy_2020_19.pdf
    • http://jimatupobosubu.rf.gd/50030239228.pdf
    • http://buxazub.epizy.com/nutanikamefunilufexuji.pdf
    • http://podoremekuzepo.rf.gd/41663940444.pdf
    • https://s3.amazonaws.com/saxefi/susan_sontag_on_photography_analysis.pdf
    • https://s3.amazonaws.com/tanapilamaxi/what_kind_of_battery_does_a_relion_thermometer_use.pdf
    • https://s3.amazonaws.com/tixedujegibex/68689382929.pdf
    • https://s3.amazonaws.com/minegikukovel/visual_schedule_template.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_off0000f657.bin
28b2ba0dae7eea832dbf5c966f3d5a67eb95e62ec003d25a4b5b82b2381361f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF657 5288 bytes
font_01_sfnt_off00010845.bin
dc1ef1ad278ee3396fd88332be56d658a9b895266e773dec2694df6b24b2d145		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10845 10724 bytes
font_02_sfnt_off00012ce3.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE3 4324 bytes

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