Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad3d39eb5b387790…

MALICIOUS

PDF

70.1 KB Created: 2021-02-16 23:36:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b29950e8ff6be5949adbdc05bc5ebe03 SHA-1: f1b9df2be076e229a7d79ebf7cbd479d212e85ec SHA-256: ad3d39eb5b387790e0b67b816e58aa16803d210aaceb1c0c968314d8103dded9
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a PDF phishing trojan. It contains an embedded URL pointing to a suspicious domain, likely intended to trick the user into visiting it. The document body, though heavily obfuscated, suggests a lure related to a 'Calphalon toaster oven manual', aligning with phishing tactics.

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://seumenha.ru/wix?keyword=calphalon+toaster+oven+manual
    • https://cdn-cms.f-static.net/uploads/4448744/normal_60257aa8f1104.pdf
    • https://cdn.sqhk.co/lolajelor/1yJj839/pinball_machine_suppliers.pdf
    • https://static.s123-cdn-static.com/uploads/4416149/normal_5fdfc6853ccb2.pdf
    • https://cdn-cms.f-static.net/uploads/4488804/normal_601b369b5dd50.pdf
    • https://static.s123-cdn-static.com/uploads/4367300/normal_5ff30d826afff.pdf
    • https://cdn-cms.f-static.net/uploads/4470821/normal_5fdae80a3b9c0.pdf
    • https://cdn-cms.f-static.net/uploads/4449603/normal_601d9a1b32cdb.pdf
    • https://cdn.sqhk.co/kinemefuwa/iasjfih/neck_check_thyroid_gland.pdf
    • https://cdn.sqhk.co/sunidoxil/hbifgjK/sotekanibaw.pdf
    • https://cdn-cms.f-static.net/uploads/4421199/normal_602afd7f73a0a.pdf
    • https://static.s123-cdn-static.com/uploads/4418778/normal_5ff51a0bf144c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wutogugej/nemakoziruz.pdf
    • https://s3.amazonaws.com/fisulefajow/academic_year_at_a_glance_calendar_template.pdf
    • https://s3.amazonaws.com/kegubinefuda/comparing_fractions_grade_3_worksheets.pdf
    • https://s3.amazonaws.com/dofufiri/bonanza_episode_guide_season_5.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_off0000d72e.bin
7b542d67d9b76809aaff5aa9dcb95bdd1c2ced5f0aee6a0b499428955ed43842		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD72E 5024 bytes
font_01_sfnt_off0000e816.bin
a4ab711f6f3ba33c576a772919d27b39ac5d07341ce560bd6b2a950d6495df44		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE816 10332 bytes

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