Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcdb791d37b930ff…

MALICIOUS

PDF

85.8 KB Created: 2021-04-14 14:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a17b84326596c7e2853bae1f1e641e28 SHA-1: e6f789f6a93bf45b0d944b04786c9248076edcd3 SHA-256: fcdb791d37b930ffc67d2c8fe80bcb54f4781b5900f2e9cc38deb2cb8aab093e
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'zajinet.ru', which is likely a malicious domain used to host phishing content or distribute further malware. The PDF structure and embedded content suggest an attempt to disguise malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zajinet.ru/strik?utm_term=que+es+un+estilo+de+vida+sostenible
    • https://cdn.sqhk.co/gitopedevid/bih7jfo/black_boy_braids_hairstyles_2018.pdf
    • http://jigatinapa.22web.org/politeness_principle_leech.pdf
    • http://girepodemaz.getenjoyment.net/meaning_and_characteristics_of_scientific_research.pdf
    • http://jaxagogilexet.sportsontheweb.net/68975313307.pdf
    • http://botavubapisod.mywebcommunity.org/21709020008.pdf
    • http://vikiduxa.mywebcommunity.org/14284047910.pdf
    • http://lumasewupuzu.iblogger.org/jexaripowuwiwirul.pdf
    • http://rixorevu.getenjoyment.net/wunexosej.pdf
    • http://zenifotekani.iblogger.org/lokakofetum.pdf
    • https://cdn.sqhk.co/kojagopomon/phm5AMh/anemias_carenciales.pdf
    • https://cdn.sqhk.co/gezefesete/jhjjgjt/66749397168.pdf
    • https://cdn.sqhk.co/bojiluxenome/xicohj1/he_art_of_the_brick_dc_super_heroes.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/54946750-2bdc-4ef9-a869-4164f2a6f186/who_won_brown_vs_board_of_education.pdf
    • http://lugenizuridaj.atwebpages.com/a_la_recherche_du_temps_perdu_acheter.pdf
    • http://vogasuzifen.rf.gd/promet_split_vozni_red.pdf
    • http://marobow.epizy.com/reliability_centered_maintenance_handbook.pdf
    • http://gulesovel.epizy.com/nike_air_force_1_white_and_black_womens_size_6.pdf
    • http://boligasenupe.rf.gd/vadidipege.pdf
    • http://desabukil.epizy.com/night_begins_to_shine_song_musicpleer.pdf
    • http://jataluwapimose.rf.gd/rojafososituzo.pdf
    • http://pevipitoz.atwebpages.com/53692912185.pdf
    • https://uploads.strikinglycdn.com/files/5e90fb18-1263-4ebd-b69a-d6a09bb0cea0/what_is_nuclear_half_life_decay.pdf
    • http://zijedan.atwebpages.com/gegote.pdf
    • http://jemukiguwuw.myartsonline.com/case_studies_in_abnormal_psychology_oltmanns.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_off00010ece.bin
66596048e74bdd0568965654ada0681d1e925a06ea46ad6735c25a93690fd882		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECE 4984 bytes
font_01_sfnt_off00011fce.bin
2cff48cc4ce61ab01353056f5efeed172e13ab61e681c566ae6dc260e703f50e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCE 12400 bytes

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