Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8fcb825286ce99…

MALICIOUS

PDF

69.0 KB Created: 2020-11-22 08:58:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 610e71b6c09b1e05efd587a73d736a64 SHA-1: 1444189cce99bc07d415ecff22730934ae9c27f7 SHA-256: 1c8fcb825286ce99d49b3dc172532667c36818fcbf162c374dc4b9e942dd5fd9
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded URL that masquerades as a manual, likely to trick users into clicking it. No scripts were extracted, but the PDF structure and embedded URI suggest a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/123?utm_term=overhead+door+owners+manual
    • https://cdn-cms.f-static.net/uploads/4381756/normal_5f9106fe3b508.pdf
    • https://cdn-cms.f-static.net/uploads/4388426/normal_5f8e3bcd14a1c.pdf
    • https://cdn-cms.f-static.net/uploads/4416332/normal_5faf9b400def2.pdf
    • https://cdn-cms.f-static.net/uploads/4374379/normal_5f8af2387f2c7.pdf
    • https://cdn-cms.f-static.net/uploads/4401703/normal_5f9e36eedcd03.pdf
    • https://cdn-cms.f-static.net/uploads/4387814/normal_5f9c557181450.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jexijer/sevubojufuwafo.pdf
    • https://s3.amazonaws.com/dadupawo/install_os_x_10.11.4_download.pdf
    • https://s3.amazonaws.com/bojafazes/91411497189.pdf
    • https://s3.amazonaws.com/benubapopikaj/forge_of_empires_guide_city_planner.pdf
    • https://s3.amazonaws.com/dorobukasawituw/cindy_trimm_ministries_phone_number.pdf
    • https://s3.amazonaws.com/bakoloj/dekowazukosezomo.pdf
    • https://s3.amazonaws.com/nuruvapozixix/89967596769.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_off0000d233.bin
d9ad8838674f4e0de24abef9aa40e6cff56e9131165a1ccc9fcc6fa1be864c83		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD233 5244 bytes
font_01_sfnt_off0000e3ed.bin
f6235d8a7238c636bb1b4499eafe6ed49ad701bbe628a7ca8d3a00bbe58b5ce1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3ED 10432 bytes

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