Malicious PDF — malware analysis report

Static analysis result for SHA-256 23e791c6cf61ec50…

MALICIOUS

PDF

75.7 KB Created: 2021-03-03 22:39:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af1ce453ee6fc332951fafe3b5a5e9a2 SHA-1: 1a495f538811ea8dd5958584703b25a90d46888c SHA-256: 23e791c6cf61ec50863a802c3d500ce69c434e83a0abf2f5cfa84e2ab829c166
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm or phishing lure. ClamAV detection and ML classification strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it is designed to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://golowaki.ru/123?utm_term=crossword+puzzle+answers+nyt
    • https://kukuziso.weebly.com/uploads/1/3/4/4/134468315/976ce68b30.pdf
    • https://cdn.sqhk.co/vemonososepa/NF6ib1a/romudigesisixef.pdf
    • http://zipubezexupoka.mywebcommunity.org/presonus_studiolive_16.0_2_dimensions.pdf
    • https://cdn.sqhk.co/sotisibu/epNgdBO/63617050886.pdf
    • http://wavakidagipav.iblogger.org/10316111584.pdf
    • http://kejoxemubogese.mywebcommunity.org/maytag_model_mvwx655dw1_problems.pdf
    • https://zedodunojoponex.weebly.com/uploads/1/3/6/0/136083391/09486af.pdf
    • http://lebizifijafaxim.medianewsonline.com/why_wont_my_canon_printer_turn_on.pdf
    • https://cdn-cms.f-static.net/uploads/4393204/normal_601c05ec61537.pdf
    • http://vizexibidoxi.getenjoyment.net/22452059901.pdf
    • http://pazifelurup.medianewsonline.com/seguxomasewageditego.pdf
    • https://gamuzajebi.weebly.com/uploads/1/3/4/4/134481120/36acc3.pdf
    • https://static.s123-cdn-static.com/uploads/4427821/normal_5ff4fdeac3f3a.pdf
    • https://pabibajezejav.weebly.com/uploads/1/3/5/3/135323938/baxezixofonoset.pdf
    • http://dizititakozazi.mywebcommunity.org/sword_art_online_alicization_war_of_underworld_all_characters.pdf
    • http://jojidasusesot.sportsontheweb.net/who_makes_the_best_portable_air_conditioner.pdf
    • https://cdn.sqhk.co/papazokixe/geljijg/jarilefasem.pdf
    • https://cdn.sqhk.co/rizijuwet/hNJ0Dgd/the_walking_dead_season_1_game_cast.pdf
    • https://pifofunota.weebly.com/uploads/1/3/0/8/130814871/mipujuwa.pdf
    • http://wivaserana.mywebcommunity.org/what_are_some_examples_of_contrast_media_reactions.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://josapug.epizy.com/zuvos.pdf
    • http://xurebamokasepa.epizy.com/venog.pdf
    • http://wumumusonozukak.epizy.com/crime_reports_map_rochester_ny.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_off0000ec16.bin
2105d198e78efba5c46657965d77fb66fefea5411a3bad6756e0cf52545f058e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC16 5104 bytes
font_01_sfnt_off0000fd97.bin
bfc44cc723a97dbac09dcc46b088c0d4dc3c824a0cba41360f3fdb8b11c7e504		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD97 10412 bytes

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