Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c58761ea3c195d…

MALICIOUS

PDF

68.5 KB Created: 2021-04-02 03:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e053694243f7f2ce1d70ea6e89b4b71 SHA-1: d42ade91302619d53f8d1619d750cfdedfecc474 SHA-256: a4c58761ea3c195d237339317055b8caf96af114206d88b6d63e72ee3c105678
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that appears to be part of a phishing lure, masquerading as a search result for technical documentation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or redirect the user to a phishing site. No scripts were extracted, but the presence of a suspicious URL and high detection scores suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://lozipotod.ru/award?keyword=allen+bradley+contactors+pdf
    • http://sigisuzuk.getenjoyment.net/gigubaligonubimapur.pdf
    • http://tafiwon.mywebcommunity.org/zefopujoxakimed.pdf
    • http://all-system7.club/4719626388478ndv.pdf
    • http://jofufunobek.sportsontheweb.net/25961443336.pdf
    • http://ductsunlimitedins.com/epson_wf_2540_wireless_setup5m7ox.pdf
    • https://cdn-cms.f-static.net/uploads/4394066/normal_60162c29d5511.pdf
    • http://tofotibuwul.sportsontheweb.net/who_are_the_fun_pimps.pdf
    • http://janipuwibir.mywebcommunity.org/institutional_capacity_development.pdf
    • https://cdn-cms.f-static.net/uploads/4495536/normal_603eb2942aa81.pdf
    • http://bepevekebezupu.22web.org/nuraretizifosurafan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jitawidavez.atwebpages.com/betekatowu.pdf
    • http://lusovipipowa.epizy.com/klebsiella_pneumoniae_infection_urinaire.pdf
    • http://pofabavulaxeli.rf.gd/3d_shape_name_matching_worksheet.pdf
    • https://8f1c0ae7-1ba6-4c51-a623-4d29f5e3aebb.filesusr.com/ugd/c1615c_f450a245520646a8a276bb91b7e83cc4.pdf?index=true
    • https://c504e2ef-f928-4e80-b5b1-fc05046f432e.filesusr.com/ugd/247f25_6b36370204784c1eb16cf5d60d8c1cc0.pdf?index=true
    • http://bodegifu.atwebpages.com/fazug.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_off0000ce5f.bin
33cd3d131ea275fbee3f5953d768167ee76eea90f870862aea774e1f4ba048fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5F 5380 bytes
font_01_sfnt_off0000e0bb.bin
6c2bfbec441cd9324cf4a013cff3046f0b48fb0ae728f99edd3e1a174da7acb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BB 10332 bytes

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