Malicious PDF — malware analysis report

Static analysis result for SHA-256 b339f862524e338d…

MALICIOUS

PDF

75.2 KB Created: 2021-03-23 04:17:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e5ecc66a8cfe3d328743fb5a8db22e8 SHA-1: d799ff7ef678586eef9cd16e215959437d23b92a SHA-256: b339f862524e338dd979a9470e5c9974c26864f736f727589a179ba7d80f0d81
96 Risk Score

Malware Insights

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

The file is a PDF that contains a URL disguised as a 'call center representative exam study guide'. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URL points to a suspicious domain, likely serving a phishing or malware payload. No scripts were extracted, but the PDF structure and embedded URI are sufficient indicators of a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://leonvi.ru/wix?keyword=call+center+representative+exam+study+guide
    • https://cdn-cms.f-static.net/uploads/4467955/normal_5fd38b19f20a1.pdf
    • http://milanbeach.fun/xefaxabusuzih1uus.pdf
    • http://italysummer.space/jovazovulosilibikozadtm4bn.pdf
    • http://world-wild-shop.com/strategic_partnership_policy_defence8yvzr.pdf
    • http://xruhdfo.site/xalatittexb.pdf
    • http://wei-nmvc.com/netgear_dgn2200v2_speeda8x5s.pdf
    • http://tersq.fun/abhimanyudu_telugu_moviewg34y.pdf
    • http://paksorond.xyz/free_westinghouse_sewing_machine_manualssub3.pdf
    • http://spainwow.pro/le_nouvel_allons_y_1_megolds2x3pj.pdf
    • http://lg-supportteam.com/xesakeviwupihzf03.pdf
    • https://cdn-cms.f-static.net/uploads/4421217/normal_6058f4f593588.pdf
    • http://vlada4.xyz/33546317784i1cdr.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bisiku/gikabasusefedowi.pdf
    • https://s3.amazonaws.com/tipikaxe/famous_quotes_diary.pdf
    • https://s3.amazonaws.com/mejados/blockbuster_song_sarainodu.pdf
    • https://s3.amazonaws.com/masevewi/bharat_gas_connection_transfer_letter_format.pdf
    • https://s3.amazonaws.com/pasutiz/pofaju.pdf
    • https://s3.amazonaws.com/tirimofufemukat/selutigafijujipikupemivu.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_off0000e5ff.bin
549b69b337091d92967d29a17f62cca6b9943b3ddb411cedd04c411957b697a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FF 5528 bytes
font_01_sfnt_off0000f8c0.bin
5e2ffcfc24f1d9991786ffeea407e53250cced988d30ec26ba2c3a42a7f6cc53		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C0 11088 bytes

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