Malicious PDF — malware analysis report

Static analysis result for SHA-256 64c4d264dabc1b78…

MALICIOUS

PDF

80.8 KB Created: 2021-03-14 19:11:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eea08c70e8daae0619dbd224ba954570 SHA-1: e140d1e4903ef3240dc94aeeab39bb06b2345197 SHA-256: 64c4d264dabc1b784b9cd670b593c298258d3b3ba68ff5e47cdd168229a97029
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an external URI pointing to a suspicious domain, mezovuduw.ru, which is likely part of a phishing campaign. The document body, though heavily obfuscated, suggests a lure related to PDF merging, which is a common tactic to entice users to click malicious links.

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://mezovuduw.ru/award?keyword=fusionner+plusieurs+pdf+en+un+seul+fichier
    • http://jedusajinud.mygamesonline.org/arbitration_act_zimbabwe.pdf
    • http://xoroketogejuxe.mywebcommunity.org/hyderabad_metro_map_download.pdf
    • http://sabumow.mygamesonline.org/6259253680.pdf
    • http://xefawojuj.mygamesonline.org/green_valley_ranch_pool_rules.pdf
    • http://lazisirogabidir.mypressonline.com/a_travs_de_mi_ventana_libro.pdf
    • http://nekuwagibajese.getenjoyment.net/fusuluvovamonixibapuperul.pdf
    • http://vuzuwul.getenjoyment.net/prepositions_and_adverbial_particles_heaton.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/legenapi/36021845919.pdf
    • https://s3.amazonaws.com/boxujetanonikuv/kaashi_amarnath_video_song_tinyjuke.pdf
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_7bcc6fc4b4424cad8dd5ed753328a001.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f606ec46-c890-4fa3-bf6f-276c2bca0a72/demosivirewanevetivosugug.pdf
    • http://vajapojaperusu.myartsonline.com/56971592398.pdf
    • http://duvodix.myartsonline.com/permaculture_a_designers_manual_nz.pdf
    • https://ff743420-c5e2-4527-a456-70ddb2a1abd8.filesusr.com/ugd/5178f2_080947a85e8241828a65eedda664e51d.pdf?index=true
    • https://19004eff-8f5e-45b0-b15a-9fbdbd99e39d.filesusr.com/ugd/578ea4_be89d4cd233e472ba22ca9e8810179b4.pdf?index=true
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_26bd14ba7d784306a58cc1719448e956.pdf?index=true
    • https://uploads.strikinglycdn.com/files/92c46510-757a-4cf6-9a54-c5492da7efd6/bemaparagibijugurojuni.pdf
    • https://uploads.strikinglycdn.com/files/5927bc85-fc1f-4398-b7a6-4bca04f228af/dikerulexuval.pdf
    • http://jabejanaboz.atwebpages.com/pdf_aromaterapia_just.pdf
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_d1555616aaf549b091126f3358c59127.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b9423d2c-f378-4470-b717-687d77564a4c/bizugobakaxaj.pdf
    • https://uploads.strikinglycdn.com/files/9a7762c4-87fa-4731-8dff-caadfcb55195/moviwazonekejow.pdf
    • https://s3.amazonaws.com/difigomisosak/kefokuritelaz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eff4.bin
88d991e7a9b201b073438809c3f571d9f411e66155d5551cfa4e6fe661ee3e24		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF4 4792 bytes
font_01_sfnt_off00010026.bin
51a84359267e3bad64676c05107a743cdf86aabf8ca17f68d173395e6282a486		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10026 11940 bytes
font_02_sfnt_off0001259d.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1259D 4324 bytes

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