Malicious PDF — malware analysis report

Static analysis result for SHA-256 990f269c4dfbd811…

MALICIOUS

PDF

125.2 KB Created: 2020-11-14 16:09:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9859578580f0d5327de280bd1a170a4 SHA-1: d2883e742153f6b38d7e44cebe0c15c58b5764b1 SHA-256: 990f269c4dfbd811f3d62d6d5b7ca4ea2ca0917c60f68dc28b35c47df5648933
96 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains an embedded URL pointing to 'https://trafffi.ru/123?utm_term=dbt+marsha+linehan+pdf', which is likely used for phishing. The PDF structure and embedded content suggest an attempt to trick the user into visiting this external resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/123?utm_term=dbt+marsha+linehan+pdf
    • https://cdn-cms.f-static.net/uploads/4409420/normal_5fa7372459917.pdf
    • https://cdn-cms.f-static.net/uploads/4377100/normal_5fa90f9c82cb3.pdf
    • https://cdn-cms.f-static.net/uploads/4465908/normal_5faea09ab2aea.pdf
    • https://cdn-cms.f-static.net/uploads/4374848/normal_5f8ea0457bbb2.pdf
    • https://cdn-cms.f-static.net/uploads/4375522/normal_5fa6de35a843d.pdf
    • https://cdn-cms.f-static.net/uploads/4455659/normal_5fa90705a902d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/42f419a4-df91-421d-a5d5-069076ab310e/vaver.pdf
    • https://uploads.strikinglycdn.com/files/1dced158-f199-49d5-875d-cfa598b458c2/82350008059.pdf
    • https://uploads.strikinglycdn.com/files/f24da578-b3b6-4fc1-867c-1f17d79c772a/dextr_o_medical_term.pdf
    • https://uploads.strikinglycdn.com/files/562fa154-f778-4803-bd4c-62b889d35ed7/pirizizaku.pdf
    • https://uploads.strikinglycdn.com/files/46c5e96b-94e4-4f28-8db4-c039e260ccae/swadian_knight_upgrade_path.pdf
    • https://uploads.strikinglycdn.com/files/422448cc-703d-4b05-aa76-2cba7a96c55e/tosagurobitasasiv.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_off0001b132.bin
9cf0e51b3ecf4f137184431812ce2b4b622151d59fe04025152aab90f9499baf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B132 5420 bytes
font_01_sfnt_off0001c36a.bin
695422c435639c8e82b48b8bae6878686b866d2152ef3f2beb8d80e7990b03fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C36A 10852 bytes

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