Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aab591092b8a9f7…

MALICIOUS

PDF

67.1 KB Created: 2020-11-22 03:01:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 100a8a3ae421827f1a296ef03cfddfe4 SHA-1: 18c9e28c48bae45ced0cb6ac95c71d99b2bb3c93 SHA-256: 3aab591092b8a9f7ee0562360a815d00edc3c5ce6c8db6beb764497f8784335e
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 domain associated with malicious activity, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, with the document body suggesting a lure for a free Windows 10 download. No scripts were extracted, but the presence of an external URI and the overall detection profile point to a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/aws?utm_term=windows+10++gratis+italiano+2018
    • https://cdn-cms.f-static.net/uploads/4367305/normal_5f895a64b6871.pdf
    • https://cdn-cms.f-static.net/uploads/4465012/normal_5fa91189bab83.pdf
    • https://cdn-cms.f-static.net/uploads/4446272/normal_5fa21c537a6a8.pdf
    • https://cdn-cms.f-static.net/uploads/4471236/normal_5fb534a6881cf.pdf
    • https://cdn-cms.f-static.net/uploads/4418587/normal_5f9c7c63e8c14.pdf
    • https://cdn-cms.f-static.net/uploads/4421214/normal_5fa46439b1473.pdf
    • https://cdn-cms.f-static.net/uploads/4383137/normal_5f924f58cae69.pdf
    • https://cdn-cms.f-static.net/uploads/4409826/normal_5f96882644cca.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bupaxomu/gazewotusaxomigejuj.pdf
    • https://s3.amazonaws.com/tosasugokod/saxon_math_printable_homework_answer_sheet.pdf
    • https://s3.amazonaws.com/henghuili-files/wijuzisureze.pdf
    • https://uploads.strikinglycdn.com/files/73a8a8e7-bc93-49ab-bcf2-5ae03fa7bcd7/19308176966.pdf
    • https://uploads.strikinglycdn.com/files/c04e1ee1-f673-481c-9071-4130ac5992fd/weligedajiga.pdf
    • https://s3.amazonaws.com/fasanag/53974584944.pdf
    • https://s3.amazonaws.com/vovuzize/97262711186.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_off0000c869.bin
f9e5e6d8c0245cb27c347a2d71766aa17d05cea872ae6adbc96f4a2a8aaed055		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC869 5616 bytes
font_01_sfnt_off0000dbaf.bin
9e3a3373535120146733327bce5e8b6ce9c7d5876808d3d052579b27ed93178f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAF 10352 bytes

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