Malicious PDF — malware analysis report

Static analysis result for SHA-256 01b33b1089c62b9f…

MALICIOUS

PDF

81.2 KB Created: 2021-03-17 07:07:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1f654cc4633a9a6ebec86a67935d73e SHA-1: 58b643e0063af1788e6807f396d5ed67871a193d SHA-256: 01b33b1089c62b9f4b67b4a541d097d59a94ac93f19bcea2c1fb0ec859a24403
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 'ponafet.ru', which is a strong indicator of a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata related to the wkhtmltopdf tool, suggesting it might be a generated document used to disguise malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ponafet.ru/wix?keyword=purific+skin+review
    • https://cdn-cms.f-static.net/uploads/4487618/normal_6049858c215ed.pdf
    • http://mailedflkf.site/adobe_flash_player_13.0_indir_gezginlerw0cqb.pdf
    • http://dfds.in/16147285143vtlpn.pdf
    • https://cdn-cms.f-static.net/uploads/4369318/normal_603a15ef14b52.pdf
    • https://static.s123-cdn-static.com/uploads/4476282/normal_5fcf0438ec545.pdf
    • http://nifazafagikoxa.medianewsonline.com/36685291553.pdf
    • http://kanshoper.site/brussels_midi_tourist_informationfr5q4.pdf
    • http://servempieza.site/sunipatafomisi47o8y.pdf
    • https://static.s123-cdn-static.com/uploads/4463300/normal_5fe031c922c70.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/2b7079e1-dd13-45d6-bfec-7f3d2d834568/cuanto_equivale_100_gr_de_mantequilla_en_tazas.pdf
    • http://pedamodaw.onlinewebshop.net/lesivusil.pdf
    • http://rezafenunuritem.epizy.com/how_to.learn_photoshop.pdf
    • http://pomigipasa.epizy.com/85577762722.pdf
    • http://verekoxamokit.epizy.com/best_workout_dvd_for_seniors.pdf
    • http://vaxesopubowutuf.rf.gd/kolipedupuwilefuluxevezuz.pdf
    • http://palexibibiw.atwebpages.com/difference_between_horizontal_and_vertical_axis_wind_turbines.pdf
    • https://uploads.strikinglycdn.com/files/d6e449cd-4c36-4fed-86fd-2ede35953b93/quelques_connecteurs_logiques_en_anglais.pdf
    • http://faperolakaf.rf.gd/welokajige.pdf
    • https://uploads.strikinglycdn.com/files/56efd4fb-fa98-4e4c-8c35-d3b01b81d011/jepuge.pdf
    • https://uploads.strikinglycdn.com/files/08f4c594-e8b7-4ed1-9970-4750cfec487c/kolupewewomuge.pdf
    • https://uploads.strikinglycdn.com/files/ab84e30c-7b7f-4601-910a-76a674c832e6/28070272511.pdf
    • https://uploads.strikinglycdn.com/files/8a922377-9931-40ba-9fae-f1c07afa51f4/meroxazifasavonilokiva.pdf
    • https://uploads.strikinglycdn.com/files/9a239738-6442-428c-b4be-4c0dd1e7c863/john_deere_d140_fuel_problems.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2fd.bin
3726ec2f269b24a171e8a5507fd9b7be462a017b53959b953e664a0a14217887		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FD 4544 bytes
font_01_sfnt_off00010285.bin
cfe50ef49667d6d0f9ef4e770f55d34309e545dc86a0f3d2fb668f283eb256fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10285 11380 bytes
font_02_sfnt_off0001293f.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1293F 4324 bytes

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