Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1ceb3b78297765a…

MALICIOUS

PDF

77.3 KB Created: 2021-03-15 04:48:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8cb77215feb6f5282fefcad8363172f5 SHA-1: 2acfdd3c3875d33ad38ae1f9919d75505a14f2d7 SHA-256: c1ceb3b78297765a99fbe9fbee79ac011ccbff7b254d1e82f56fe3010d1291b6
96 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 embedded URI pointing to 'zajinet.ru', which is likely the phishing lure. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest an attempt to trick the user into navigating to a malicious site, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://zajinet.ru/award?keyword=medical+certificate+pdf+rajasthan
    • https://cdn.sqhk.co/tarekekog/hewlgio/tile_shop_near_meadowhall_sheffield.pdf
    • https://cdn.sqhk.co/giganopof/dtjcmuy/76865256731.pdf
    • https://cdn.sqhk.co/vopupevomate/02esidf/71709735401.pdf
    • https://cdn.sqhk.co/sufokorume/j1TCQic/idle_theme_park_tycoon_horror_island.pdf
    • http://riwotivadejud.sportsontheweb.net/hostage_to_the_devil_2016.pdf
    • https://cdn.sqhk.co/rotonoba/Q4p2Wid/ritekolag.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4e19c105-7278-4da5-82e2-7822242e063e/how_to_pair_merkury_bluetooth_headphones.pdf
    • https://s3.amazonaws.com/mesotodimus/free_christmas_powerpoint_templates_animated.pdf
    • https://s3.amazonaws.com/voxipanovigepiv/40651096242.pdf
    • https://uploads.strikinglycdn.com/files/50008bfd-99fe-4e41-ad44-476558a9d669/vonutuwubepivesonexirikux.pdf
    • https://s3.amazonaws.com/rowubunak/chris_tomlin_music.pdf
    • https://s3.amazonaws.com/litunux/41817292498.pdf
    • https://s3.amazonaws.com/goneduzum/73471404284.pdf
    • https://s3.amazonaws.com/xirixepo/3d_photo_screensaver_free.pdf
    • https://s3.amazonaws.com/ropuba/25927862944.pdf
    • http://zavulelobawabi.onlinewebshop.net/81963480881.pdf
    • https://uploads.strikinglycdn.com/files/0b06377c-fd08-4102-a921-b9da1347d1b0/jojur.pdf
    • https://uploads.strikinglycdn.com/files/a428ee8e-90c6-4d1d-9d95-1a20acac99db/how_much_is_larry_davids_net_worth.pdf
    • https://s3.amazonaws.com/fivebo/convert_multiple_excel_sheets_to_vba.pdf
    • https://s3.amazonaws.com/tipikaxe/petedowobin.pdf
    • https://s3.amazonaws.com/nuxulikiwab/78380507793.pdf
    • https://s3.amazonaws.com/patotale/airserver_universal_x64_free.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_off0000f1ef.bin
dcb3d1ec8cf489b594797cd24df3a760e2fd3e7de9effbdf4fcad3ca6283a058
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EF 5324 bytes
font_01_sfnt_off00010412.bin
1e69746f722589a97fde1ce4969292b18017f11e855653fa109c691c39c39482
pdf-font-stream PDF embedded font (sfnt) at offset 0x10412 10320 bytes