Malicious PDF — malware analysis report

Static analysis result for SHA-256 4239cf67a3edaa60…

MALICIOUS

PDF

69.7 KB Created: 2020-11-17 10:04:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 7cb608174ad76c89def11a8aa0356a68 SHA-1: 1754048e53fe0e19b0ce0a7d9e2b1279d8f1eb87 SHA-256: 4239cf67a3edaa60195e4429f8c2ed18567ec932a9dd3439944ef6779595dba7
96 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded URIs pointing to external websites, one of which is trafftec.ru. The presence of these URIs suggests an attempt to redirect the user to a malicious or phishing site. No scripts were extracted, but the PDF structure itself indicates malicious intent.

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://trafftec.ru/123?utm_term=aviation+weather+center+prog+charts PDF link annotation
    • https://sivanijizifi.weebly.com/uploads/1/3/4/8/134848714/kimudijedov.pdfIn PDF document text
    • https://doriruvoni.weebly.com/uploads/1/3/4/5/134585963/71dfcba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383791/normal_5f9884039732e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427544/normal_5fb2ac4898d6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426572/normal_5fadd5f5e5ef5.pdfIn PDF document text
    • https://fetibafavi.weebly.com/uploads/1/3/0/7/130776688/zuvugipo-jazivifugewazu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413346/normal_5fb309c661e86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369660/normal_5fabcde6715c2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/40ed1027-d48e-4797-ad04-26b09165d95d/c_programming_in_easy_steps_4th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/389d60d4-f9a4-4a6f-99b3-f5019b609251/xomunejutolixapegadafevo.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/effortless_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db85cf95-da30-4572-b746-e1f61e665776/63586576936.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d2834e3-223e-442f-acb4-549e3d5dede8/11302915084.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/mastering_python_networking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68c2bfea-c63b-4745-86ed-a20964d9e9d9/14324616332.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_off0000d1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B5 5304 bytes
SHA-256: 51842fca688ea46b0960892813154b34da144e55bf7fea13e32c4bb8288986da
font_01_sfnt_off0000e3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DB 11832 bytes
SHA-256: 9e31dc0cdacca6cd37e8cdaf6ca18329aea60369518a473ed6a20e832917c67a

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