Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d816825873be609…

MALICIOUS

PDF

66.5 KB Created: 2020-11-13 23:24:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77813c9484202327613dd10a6c52a64d SHA-1: 7c8a36e496c069954e43cd074cc85174a88b20a2 SHA-256: 4d816825873be6096ede139712f096a1868a04fd81d95265522ba2bfeb6babc1
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL pointing to 'trafficel.ru', which is likely used to lure victims. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect users to a malicious site, consistent with spearphishing.

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://trafficel.ru/123?utm_term=standard+methods+for+the+examination+of+water+and+wastewater
    • https://xumusiroti.weebly.com/uploads/1/3/4/3/134321309/wodapo-nupijanivekulu-fagerogakid-kikubu.pdf
    • https://cdn-cms.f-static.net/uploads/4379359/normal_5fa919dce1887.pdf
    • https://cdn-cms.f-static.net/uploads/4380079/normal_5f8c2afb48e37.pdf
    • https://cdn-cms.f-static.net/uploads/4413007/normal_5f9e7f68effce.pdf
    • https://cdn-cms.f-static.net/uploads/4365660/normal_5fadc8ed21853.pdf
    • https://vikuxujawud.weebly.com/uploads/1/3/4/5/134515409/9509940.pdf
    • https://cdn-cms.f-static.net/uploads/4365607/normal_5f870351b8024.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3118adc7-ff67-4053-8eef-bb39e97da505/16789848887.pdf
    • https://uploads.strikinglycdn.com/files/fd86bfba-cd60-4a48-9672-478aedf1fee3/nami_and_luffy_moments.pdf
    • https://uploads.strikinglycdn.com/files/fb474122-6587-4c1c-b8ba-23d5c58a0296/kotafobojoboxi.pdf
    • https://uploads.strikinglycdn.com/files/2c7c050e-5071-4468-a6c5-ca3ee214d7c9/tatupivuwad.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_off0000c77f.bin
0349c927433267792a43d27bc2f2be1df41b6ac0989a980b0feb6a925c4da9b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC77F 5376 bytes
font_01_sfnt_off0000d9b4.bin
ee8f0be6342a7703dfed638d550dc8f27e62e561167c203a18d5f921c12699c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B4 10268 bytes

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