Malicious PDF — malware analysis report

Static analysis result for SHA-256 c19049404543a9e3…

MALICIOUS

PDF

77.9 KB Created: 2020-11-18 05:46:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23a8fa8da8c84e4127d246dc1e675166 SHA-1: 76e6c3d8a60d2c510f119269e9059e537920dbae SHA-256: c19049404543a9e316213b6f7eb39af14040e8b1f50977a58317b46c7d6fc958
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It contains a large number of external links, suggesting a link farm or a phishing lure. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to redirect users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffine.ru/strik?utm_term=differences+between+constitutional+and+nonconstitutional+governments
    • https://cdn-cms.f-static.net/uploads/4366659/normal_5f882f07359ff.pdf
    • https://cdn-cms.f-static.net/uploads/4367301/normal_5f873ac6387cb.pdf
    • https://cdn-cms.f-static.net/uploads/4403681/normal_5f94215bbc654.pdf
    • https://jeretidaker.weebly.com/uploads/1/3/4/5/134595905/wupimipanu_wuniruloku.pdf
    • https://cdn-cms.f-static.net/uploads/4379736/normal_5fb3de1d8e88d.pdf
    • https://cdn-cms.f-static.net/uploads/4382638/normal_5f8c7746c59b5.pdf
    • https://cdn-cms.f-static.net/uploads/4381748/normal_5fa7e915483d7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mijumomub/81436307584.pdf
    • https://s3.amazonaws.com/temujonuwu/watch_endgame_free_online.pdf
    • https://s3.amazonaws.com/fasanag/brother_sewing_machine_manual_ex660.pdf
    • https://uploads.strikinglycdn.com/files/328314c6-c4f1-4408-92ac-f769c3d1c2e0/zodikuwafeje.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_off0000f35f.bin
c4bbdfdc270f9cd636ae706283d5e8f662cb4192698f3b797b54dc1f804ea73c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF35F 5632 bytes
font_01_sfnt_off00010698.bin
861a7a29ecf1fc44f696eaf07682a4caed32ae4e11c4290d4f1ecc5c2a641aab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10698 10384 bytes

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