Malicious PDF — malware analysis report

Static analysis result for SHA-256 b08e5634bdac7af3…

MALICIOUS

PDF

64.1 KB Created: 2020-11-25 20:40:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad1aa1ae8f7de3d5d0e1fe05b2094e53 SHA-1: 0cc5701b4e0f3c7b42dc1bf1a50b9d5c9d198225 SHA-256: b08e5634bdac7af38a52e484c0cb9de00398d83586967854d680a034a9f0057c
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The file is detected as malicious by ClamAV and an ML classifier. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to paste content into a shell, a common tactic for executing downloaded payloads. While no scripts were directly extracted, the PDF's structure and the presence of an external URI suggest it's designed to facilitate further compromise, likely through a command-line execution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://trafftec.ru/aws?utm_term=aws+cli+command++from+s3
    • https://cdn-cms.f-static.net/uploads/4394072/normal_5f9351b785c1f.pdf
    • https://cdn-cms.f-static.net/uploads/4427501/normal_5fb53786ab1fc.pdf
    • https://cdn-cms.f-static.net/uploads/4426551/normal_5f9e842dd4ab7.pdf
    • https://cdn-cms.f-static.net/uploads/4419205/normal_5fa30a764f9cc.pdf
    • https://cdn-cms.f-static.net/uploads/4366042/normal_5f8e41dc57518.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rupatojuko/31963993262.pdf
    • https://uploads.strikinglycdn.com/files/1433ee3d-86a0-491f-8160-a009e508f1ff/the_secret_rhonda_byrne_movie_in_hindi_download.pdf
    • https://s3.amazonaws.com/fosawef/chicken_noodle_soup_j_hope_song.pdf
    • https://s3.amazonaws.com/latufenaw/96190437495.pdf
    • https://uploads.strikinglycdn.com/files/764f29b6-5edc-4645-91e4-f5bd21c62572/69485481453.pdf
    • https://s3.amazonaws.com/nefagolom/economic_system_of_virginia_colony.pdf
    • https://s3.amazonaws.com/tibanepoxilibud/nuvalesulowenefefu.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_off0000be30.bin
4417b2da3b3c8b1c3bf4382c5513db107d935a8f2ef780abf5a7001227830fe3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE30 5412 bytes
font_01_sfnt_off0000d096.bin
c261d4f9c699038c8c4696adbaff7ea653f1c4664cbd5877afc38dd8d9d77503		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD096 10328 bytes

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