Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6c28f773defbed1…

MALICIOUS

PDF

78.2 KB Created: 2021-05-23 00:40:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a3aaea777a79393fe8c87a30aa24c5f SHA-1: 411ce4d3e468d2028e99a96acadd633e4937f584 SHA-256: f6c28f773defbed1d87d7ae1dec2dddb27b5936b14027fe2b345003f614e3568
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 URI pointing to a suspicious domain, mezovuduw.ru, which is likely used to host a malicious payload or phishing page. The document body, though heavily obfuscated, contains metadata suggesting it is presented as a manual.

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://mezovuduw.ru/strik?utm_term=toro+recycler+22+manual+20340
    • https://cdn-cms.f-static.net/uploads/4370294/normal_604684f0d0d81.pdf
    • https://cdn-cms.f-static.net/uploads/4501037/normal_604940ee5a8fb.pdf
    • https://static.s123-cdn-static.com/uploads/4365660/normal_5fdf19d2c393d.pdf
    • https://cdn-cms.f-static.net/uploads/4464539/normal_6043ce592bb4e.pdf
    • https://static.s123-cdn-static.com/uploads/4489969/normal_6001f42b6bee6.pdf
    • https://cdn-cms.f-static.net/uploads/4366327/normal_6050fc6b84670.pdf
    • https://cdn-cms.f-static.net/uploads/4492575/normal_601c6334f31d0.pdf
    • https://static.s123-cdn-static.com/uploads/4464525/normal_5fec998414260.pdf
    • https://static.s123-cdn-static.com/uploads/4405642/normal_5fc5bade33094.pdf
    • https://cdn-cms.f-static.net/uploads/4411489/normal_5fea18ff3bd7c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/068a4a26-c8c7-41c5-a8f8-b35fb4594e58/72148978502.pdf
    • https://uploads.strikinglycdn.com/files/1c6c0314-c3a5-417c-bdd8-9655bf3bc6d8/how_to_disassemble_livestrong_treadmill.pdf
    • https://uploads.strikinglycdn.com/files/1a773f7e-4f22-4289-b4f3-d613dd81c10f/25902755302.pdf
    • https://uploads.strikinglycdn.com/files/39fd9af0-1563-461c-9e1a-8e42e98da462/how_to_install_maxtor_onetouch_4.pdf
    • https://uploads.strikinglycdn.com/files/0f9036e0-a107-45b7-98fc-80202491b46c/24281195590.pdf
    • https://uploads.strikinglycdn.com/files/89e70590-9d2c-4b72-9775-e2d5b3e72d3a/husqvarna_yth24k48_battery_size.pdf
    • https://uploads.strikinglycdn.com/files/7ae1e892-12eb-4230-af4a-32243b8f40ef/92920055393.pdf
    • https://uploads.strikinglycdn.com/files/42a5fdbf-43c0-4309-83fe-0e2d6d80cb43/how_much_do_you_get_paid_at_kindercare.pdf
    • https://uploads.strikinglycdn.com/files/eaccb225-8e20-469c-8b81-68d34770858f/zipop.pdf
    • https://uploads.strikinglycdn.com/files/a6eaf7d9-ec52-400f-a415-b730481392e7/88668215622.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_off0000f4bb.bin
aed32bc1f561007a412ab55803fbbda1859c511c841e5222ed3d05476534ae2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BB 5344 bytes
font_01_sfnt_off000106da.bin
64f771d7bf2ffb860b867e9aef25d12857249da717612cbc33e49929ce0b175b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106DA 10336 bytes

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