Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca733144cb879486…

MALICIOUS

PDF

69.7 KB Created: 2021-01-02 17:39:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d523817a0e28920b391e00f7c80a84e3 SHA-1: b23c0565355fed5c59958f2333b6a8ab211ae3ca SHA-256: ca733144cb8794867385a58fd3902318b9e02ffb624b5827a79136592f97d37f
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely used to deliver a secondary payload or redirect users to a phishing site. No scripts were extracted, but the presence of the URI and the overall detection suggest a phishing or malware distribution attempt.

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://trafftec.ru/123?utm_term=100+cotton+socks+kids PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365636/normal_5f8aca2b673ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406782/normal_5fb265b9d2f3c.pdfIn PDF document text
    • https://cdn.sqhk.co/vamunidibu/zGhdKic/51805525338.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/71481775842.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96382688-78d9-481c-9ded-b3b47a36a756/25097815952.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/set_default_checked_radio_button_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef3e8fbd-fbe1-4c2f-8c78-4aee0e46bf04/explosion_of_rot_pathfinder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c6a6ae7-6a5f-44b1-a935-9f817e2a7812/nexikofaxavepasetoripo.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/the_number_song_logan_paul_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/u_pick_pumpkins_ny.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a5b55e1-ff67-4cd8-9345-5837eaa236ce/kuneledet.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/collecting_and_presenting_data_worksheets.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78A 4756 bytes
SHA-256: fe07f00f913597a03d7c37c5fcb03bbb59c2aac49f84a83a59fc8cab163ac5fe
font_01_sfnt_off0000e7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CD 9980 bytes
SHA-256: ae4cae14f0d508b6a32bcdedec51f503e067cdb380c129b9afd1963932407baa