Malicious PDF — malware analysis report

Static analysis result for SHA-256 061f063726693037…

MALICIOUS

PDF

85.6 KB Created: 2021-03-17 20:11:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f133685379da7237d6b2c0483b4b4d58 SHA-1: 74318c069ffa94637c398bfeeab562789216a5ec SHA-256: 061f063726693037a613d495fb243a455451d8f2f2b0a5744b32d6bb857e765b
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one pointing to 'pelibifir.ru', suggesting it's designed to redirect users to potentially harmful websites. The PDF structure and embedded links are indicative of a phishing or malware distribution lure, likely using a social engineering pretext to trick users into visiting the linked site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/strik?utm_term=diagrama+de+fases+isomorfo+pdf
    • http://xididefix.22web.org/vutemof.pdf
    • https://cdn.sqhk.co/silakozafi/yidhxia/fizusizudirari.pdf
    • https://cdn.sqhk.co/mufipofunup/geihmid/ultimate_photo_mixer_for_pc.pdf
    • http://getepitisux.mywebcommunity.org/16557655475.pdf
    • http://nedugitovo.iblogger.org/bupiwijawitoji.pdf
    • http://zekifafeter.scienceontheweb.net/544977723.pdf
    • http://miromawetibikew.mywebcommunity.org/43894264326.pdf
    • https://cdn.sqhk.co/nedabuke/hgihDib/21634640117.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4b58c04b-e335-4744-b9de-81cadf316e05/how_to_put_captions_on_pictures_in_microsoft_word_2010.pdf
    • http://xikusaduxofi.atwebpages.com/rival_crock_pot_smart_pot_instructions.pdf
    • http://viwuwijagabote.myartsonline.com/58441162623.pdf
    • http://buzumigasox.myartsonline.com/graphic_designer_experience_certificate.pdf
    • https://s3.amazonaws.com/papuja/55261753475.pdf
    • https://s3.amazonaws.com/vabedafozo/why_is_bangladesh_so_dangerous.pdf
    • http://luregaw.onlinewebshop.net/noradokoxemazeja.pdf
    • https://uploads.strikinglycdn.com/files/75a3e7b5-d315-47ba-8503-82ee64b172d7/how_to_reset_a_combi_boiler.pdf
    • https://uploads.strikinglycdn.com/files/c3c9d589-787d-4134-920c-9ecea66a8294/how_much_is_1_serving_of_romaine_lettuce.pdf
    • http://sutawezazijarof.rf.gd/66216280554.pdf
    • https://s3.amazonaws.com/solonebosop/ditete.pdf
    • http://neketepa.myartsonline.com/20375231849.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_off00010cc6.bin
87a5e6144f70dd736a8dd4a9101b59e51365cf90f5f652d8d911835ddbcc9fff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC6 5328 bytes
font_01_sfnt_off00011eda.bin
e58162e032349311eef8cfc783f4f1ed0a4bf800e35af31cc5207e0f7ebc467f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDA 12548 bytes

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