Malicious PDF — malware analysis report

Static analysis result for SHA-256 23bc79384ad0c375…

MALICIOUS

PDF

75.0 KB Created: 2021-03-09 00:04:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 2ff3a7e946ba26f55ef100241146c282 SHA-1: 8e6aef3e5769e76358d78feff8aaba26872717b0 SHA-256: 23bc79384ad0c375801d28bbbd544022bf4617057f348b150f46ab27051df38d
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of an external URI pointing to 'vilenefex.ru' suggests an attempt to redirect the user to a potentially harmful site. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and 'engineering circuit analysis', likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vilenefex.ru/wb?keyword=basic%20engineering%20circuit%20analysis PDF link annotation
    • https://cdn.sqhk.co/zubixola/jBRgckt/bokulilefebiri.pdfIn PDF document text
    • https://cdn.sqhk.co/tejilunuf/hhP3ieo/pirate_battleship_game_ks2.pdfIn PDF document text
    • http://zolomakowifop.iblogger.org/30588835315.pdfIn PDF document text
    • https://cdn.sqhk.co/mogudekusab/jeRzic0/crayon_shinchan_runner_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/norifasil/goojajf/30007266538.pdfIn PDF document text
    • https://cdn.sqhk.co/tibakekavero/3Vgfjhj/online_calculator_scientific_with_exponents.pdfIn PDF document text
    • https://cdn.sqhk.co/netesatova/jbHlZii/poxiwek.pdfIn PDF document text
    • http://famesodelazij.22web.org/wisconsin_child_care_forms_and_publications.pdfIn PDF document text
    • https://cdn.sqhk.co/wozejodes/gbiegda/best_hair_braiding_salons_in_philadelphia.pdfIn PDF document text
    • https://cdn.sqhk.co/wosipuvetot/APvz6if/57442217274.pdfIn PDF document text
    • https://cdn.sqhk.co/mobirewin/czjige9/76236351812.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/87121331038.pdfIn PDF document text
    • http://kikumofesokir.rf.gd/conversion_challenge_answer_key.pdfIn PDF document text
    • http://suxulumogu.rf.gd/dedidifu.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/48039104776.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/motorhome_magazine_dinghy_towing_guide_2010.pdfIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/formato_requerimientos_ieee_830.pdfIn PDF document text
    • http://tisudaxutuz.epizy.com/articles_a_an_the_test.pdfIn PDF document text
    • http://zasufogokalo.rf.gd/macbeth_characters_chart.pdfIn PDF document text
    • http://pepagipil.epizy.com/sub_zero_refrigerator_ice_maker_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/37841697164.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/jidizupuvasixisefemabis.pdfIn PDF document text
    • http://segukoter.rf.gd/the_love_shack_menu_ocean_springs.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/best_python_book_for_beginners_in_india.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89B 5116 bytes
SHA-256: 28ce517048715ae869563c71fa0100bb5f201aca40d6b5e1b4a6745fc72e37e2
font_01_sfnt_off0000fa1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1D 10708 bytes
SHA-256: 5b1cf3632a44549c971d987354dec6d315977fdd9865b147679fade0fc1531d9

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