Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cef9c53e58d17ce…

MALICIOUS

PDF

73.3 KB Created: 2021-06-10 06:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c34cdf769e332276ef3a1a6b58f4fe80 SHA-1: 03798a1107bcc14e3b787c59043df4c105c1ba8c SHA-256: 9cef9c53e58d17ce9253cfb8cee22541ceb9aa2b843773db098ddf627d121252
96 Risk Score

Malware Insights

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

The file is a PDF containing obfuscated content and a heuristic firing for an external URI. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URL points to a suspicious domain, likely used for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/pbw?utm_term=92+in+periodic+table
    • https://cdn-cms.f-static.net/uploads/4393204/normal_6044211a63260.pdf
    • https://cdn-cms.f-static.net/uploads/4490949/normal_5fd92246e186b.pdf
    • https://cdn-cms.f-static.net/uploads/4381534/normal_606d3a12d12d7.pdf
    • https://cdn-cms.f-static.net/uploads/4382962/normal_6057fa5be7106.pdf
    • https://lajojadarexod.weebly.com/uploads/1/3/4/5/134506383/vitojoput.pdf
    • https://cdn-cms.f-static.net/uploads/4379489/normal_60150b5726397.pdf
    • https://static.s123-cdn-static.com/uploads/4453105/normal_5ffc740741330.pdf
    • https://cdn-cms.f-static.net/uploads/4371247/normal_6036351ac04e5.pdf
    • https://cdn-cms.f-static.net/uploads/4498842/normal_6010421d9d14f.pdf
    • https://static.s123-cdn-static.com/uploads/4480904/normal_5fefa6b92ab07.pdf
    • https://kudiwugeditonaf.weebly.com/uploads/1/3/5/9/135964520/magakutebegewinewego.pdf
    • https://naloripuzugusow.weebly.com/uploads/1/3/4/8/134850631/4709939.pdf
    • https://dopovubejaxow.weebly.com/uploads/1/3/4/0/134017692/vulotetegobasa.pdf
    • https://vatewiwep.weebly.com/uploads/1/3/4/4/134482367/696d5297f75.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://demopefo.pbworks.com/w/file/fetch/144807102/how_to_put_my_plantronics_headset_in_pairing_mode.pdf
    • http://mujefapufefi.pbworks.com/f/swift_dark_substratum_theme_apk_cracked.pdf
    • http://gokuluxitup.pbworks.com/w/file/fetch/144894804/pablo_escobar_mi_padre_audiolibro.pdf
    • http://fepewuwakow.pbworks.com/f/49709471984.pdf
    • http://febokipup.pbworks.com/w/file/fetch/144919185/best_iphone_text_tones_2020.pdf
    • http://redelaw.pbworks.com/w/file/fetch/144587826/22435951694.pdf
    • http://beratirupo.pbworks.com/w/file/fetch/144602502/how_to_wash_mattress_protector.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_off0000df8a.bin
aa5e75364ef1bc13db233ce4e07ec1f5f43e34de3301b652a95cb3ea29bd7f88
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8A 5224 bytes
font_01_sfnt_off0000f152.bin
786b44a16d6e2e4800d470fde66ff96c60e366d01a70ca45792c513fc2f853f9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF152 11024 bytes