Malicious PDF — malware analysis report

Static analysis result for SHA-256 03c99a2b989a2969…

MALICIOUS

PDF

78.0 KB Created: 2021-04-01 17:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 331e44dbe98c344a8be928a7a3014ba6 SHA-1: 5a544d8ae8605282ff143a26a1d09c923d46a80e SHA-256: 03c99a2b989a29697407f3a5967c74daf7dc59028853c32c655cca09d4745b4b
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a suspicious domain, identified by heuristics as a potential phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or malware delivery.

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://nipisod.ru/award?keyword=antigone+pdf+jean+anouilh
    • https://cdn-cms.f-static.net/uploads/4367667/normal_5fe7ddb972d7d.pdf
    • https://cdn-cms.f-static.net/uploads/4410443/normal_6045f8bcd5b4e.pdf
    • https://cdn.sqhk.co/kuniremolu/fgirqn5/amazon_seller_support_associate_pay.pdf
    • https://cdn-cms.f-static.net/uploads/4468836/normal_5fdb0cf61e95c.pdf
    • https://cdn.sqhk.co/kelulegawi/jHhj6hd/gijezidevamiziluvakol.pdf
    • https://static.s123-cdn-static.com/uploads/4499656/normal_5fe154f8a1074.pdf
    • https://cdn.sqhk.co/lewiwifo/ihjbrjc/short_ride_game_online_play.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_d0428bc4243d488a82273e5bcf51346b.pdf?index=true
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_e90139205883498a9d3d75d892003d4c.pdf?index=true
    • https://e49cd12a-7e53-4a25-9f98-ae37b5ff2e44.filesusr.com/ugd/35dc59_18c609485d514deda94029bddbb0626f.pdf?index=true
    • https://s3.amazonaws.com/lixasifasi/99291361877.pdf
    • https://s3.amazonaws.com/megujobemegor/mevukerimivesesewud.pdf
    • https://s3.amazonaws.com/widiku/free_music_to_my_cell_phone.pdf
    • https://4f870d4f-701c-4ec6-bbb3-7277acc5528a.filesusr.com/ugd/fdcb8d_16ace2ababb344b0a90170f42eea1e34.pdf?index=true
    • https://s3.amazonaws.com/tiniruru/koposonavupunox.pdf
    • https://160e4e15-e27a-4ef2-9b26-f67fc0969a86.filesusr.com/ugd/cbdbb6_9aabba72cb954010baa5309938a02e15.pdf?index=true
    • 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_off0000f34a.bin
d2a6143dee806d30da4f99b64368b6aa1e04d03d8c02e9a4e54963fb3b9580cd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF34A 5096 bytes
font_01_sfnt_off000104ac.bin
3896d37da717462267c276b16e3617a01c6769ffd66f0e227e0a06fb02073eef
pdf-font-stream PDF embedded font (sfnt) at offset 0x104AC 11420 bytes