Malicious PDF — malware analysis report

Static analysis result for SHA-256 76d61b06a406ca64…

MALICIOUS

PDF

75.5 KB Created: 2020-12-24 15:53:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a2094469dabd26fd4295092d3d9b251a SHA-1: 7acceca68090dcb6f326e1dfa8a2dc71d544564e SHA-256: 76d61b06a406ca64fe37fec9941bd051752eddf459d445b2c54ff9a60b3550e4
104 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by a ClamAV detection and an ML classifier, indicating a high likelihood of malicious intent. The presence of a download button lure and an embedded URI pointing to a suspicious URL suggests the document is designed to trick users into downloading a payload. The ClamAV detection name 'Pdf.Phishing.Trojan' further supports a phishing and trojan delivery scenario.

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=download+game+crazy+taxi+classic+mod+apkpure PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375339/normal_5f8f14522ae9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372086/normal_5f91e06c9633d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471250/normal_5fa42ce500272.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489240/normal_5fe3c6357c0a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366973/normal_5f872dc638298.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484355/normal_5fbd9ce44d1df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480174/normal_5faeceeca28fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468268/normal_5fac51fd1c1ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481831/normal_5fafd6fef0f4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387428/normal_5f92357c1dce3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/252b4260-cb8c-43ec-b8e8-8000b1192610/97854008981.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/75898096689.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/qutip_for_ears.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/gizujolulawejiw.pdfIn PDF document text
    • https://s3.amazonaws.com/lesepapusojifax/bebuluzisilikamujomam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcda8612-18d5-4d0e-a672-dfd941ad03ed/74694245797.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B8 5648 bytes
SHA-256: 90e3c14ba18016771e7115247923e32c9a30b7e87b37e1ab414d0331bcbdda99
font_01_sfnt_off0000ec07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC07 11456 bytes
SHA-256: e3c7947c4f70b00f42f3aba56349cb260e76869e4520c9c826ee03f995187b53
font_02_sfnt_off000112b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B7 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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