Malicious PDF — malware analysis report

Static analysis result for SHA-256 acb0c37d31f15259…

MALICIOUS

PDF

70.4 KB Created: 2020-12-07 03:11:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c305cc9e777de42a71b152ec70bb6b40 SHA-1: d162cb5f82da6e1f470d0a7a19c9f36ee5ec5e68 SHA-256: acb0c37d31f152599a7ca9320b1f45f02210d8989ddeeac78a0ba9da49c1f429
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that redirects to a phishing site, disguised as quiz answers. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristic suggest it's designed to exploit users by directing them to a malicious domain.

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://traffnew.ru/123?utm_term=glencoe+algebra+2+chapter+6+quiz+answers
    • https://cdn-cms.f-static.net/uploads/4391315/normal_5f8deefe964bc.pdf
    • https://cdn-cms.f-static.net/uploads/4388613/normal_5fa93bcd54cc3.pdf
    • https://cdn-cms.f-static.net/uploads/4374835/normal_5f915bb59d252.pdf
    • https://cdn-cms.f-static.net/uploads/4375698/normal_5f9d026d0045e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/43c99d46-cdc5-487c-aa83-5a70681bd1fa/nutidaribemimulagazo.pdf
    • https://uploads.strikinglycdn.com/files/9772be18-08d5-4e92-9ecd-827529576168/toshiba_laptop_user_guide.pdf
    • https://uploads.strikinglycdn.com/files/7f6dc57d-309d-44ed-9659-fd242d2f5dbe/smash_bros_ultimate_user_manual.pdf
    • https://uploads.strikinglycdn.com/files/2de57ca2-4be1-44dd-8ec2-487e077694e7/65016369884.pdf
    • https://uploads.strikinglycdn.com/files/fe8ce3b5-2767-4050-a2d8-79879f78a3f8/94372522930.pdf
    • https://uploads.strikinglycdn.com/files/2a8a4622-e523-4ba6-a7d6-0c80cf5451bc/24391729812.pdf
    • https://uploads.strikinglycdn.com/files/c23c24e0-3b95-4935-a1d9-67ad89dac4fb/emma_watson_private_photos.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c715.bin
a28fcc4ba65d8171a55e8b87d646ac5d1dd213f66ab2b0026fd39e5ca5d32d1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC715 2900 bytes
font_01_sfnt_off0000d157.bin
50dd331850df5eb9265fbd8d0908fa0ea706041a848cef6b772a015527d52160		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD157 5920 bytes
font_02_sfnt_off0000e593.bin
47aeb652bb421d82706f3c7fec8e1c45e9a62600d0e83afae34507c6bc0691fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE593 11500 bytes

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