Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6b6b6e2fdd1a1c8…

MALICIOUS

PDF

81.2 KB Created: 2021-03-17 18:17:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27e9852665142d4e6152bbac7836ff57 SHA-1: 70f3ed66fa25a0e5ed4b0402390db4c940a58b7e SHA-256: a6b6b6e2fdd1a1c88e1385986078e08a16eff2242a9a99d5bc1387c1f1fe94ab
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL leading to a suspicious domain, vilenefex.ru. Heuristics indicate the presence of external URIs and ML classifiers strongly suggest malicious intent. The document body, though heavily obfuscated, contains keywords related to PDF editing, suggesting a lure to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/award?keyword=cut+and+edit+pdf+online+free
    • http://feyakast.online/gubafusamivovajerujetiepfj5.pdf
    • http://bit7.top/959557419328uw0g.pdf
    • http://didoruzugage.22web.org/rupuzopifasixitab.pdf
    • http://blockhcain.host/ferrari_logo_black_cargpv4x.pdf
    • http://sotinifox.22web.org/57037814388.pdf
    • http://testersairf.xyz/firefox_47_free_filehippojcqwn.pdf
    • http://select-get.top/84875982300lb86x.pdf
    • http://sevixewevutan.22web.org/ringtones_telugu_songs_free.pdf
    • http://vololagabedopi.22web.org/power_air_fryer_oven_elite_user_manual.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/18302ee0-6b0e-4c36-af9a-851d558eb628/post_office_mail_rates_for_international.pdf
    • https://uploads.strikinglycdn.com/files/dab01b73-9d4a-403c-a2c6-fb7d0d75632b/how_to_lose_weight_fast_no_exercise_no_diet.pdf
    • http://puwowiwu.epizy.com/cuisinart_dgb-700bc_grind_and_brew_12_cup_coffee_maker.pdf
    • http://bezepegu.epizy.com/blufftitler_software_free_full_version.pdf
    • http://danesanifulen.rf.gd/free_template_powerpoint_canva.pdf
    • http://nivawuxiki.rf.gd/kirosakefapexuxawuwem.pdf
    • https://9a4203bb-6ff2-4ef1-9c63-3f113f84a884.filesusr.com/ugd/ea9bdf_6c2b0250e56345878a3327ab89570715.pdf?index=true
    • https://6b52f5a6-db44-4d3e-8337-ab33c729cb13.filesusr.com/ugd/f4de5e_b716a93ba38c48f7be19e4435425da5c.pdf?index=true
    • http://guvamimifufirar.rf.gd/domumejo.pdf
    • https://4bc473c2-84d0-4913-8b4e-281bf44fba2e.filesusr.com/ugd/a25dbd_d6369678e78e48398e91f585e18f3cd6.pdf?index=true
    • http://nifopufu.epizy.com/bmw_x3_2018_owners_manual.pdf
    • http://finabupotokuko.epizy.com/bisadulunizuzalebaje.pdf
    • https://uploads.strikinglycdn.com/files/e80a3eee-fe8c-4d42-b39e-f87b5f5bd334/why_does_my_bose_radio_say_please_wait.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_off000101f2.bin
849b0d2155ea187fe5ee999b888af27e9c72631fada98e9f1fdb6db1101cee11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101F2 4760 bytes
font_01_sfnt_off00011230.bin
d1e530874d3e23a83ada826c01cd974707e4e983249b0a9998f0ff8f4e10d8ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11230 10824 bytes

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