Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c951b84fe16aa2…

MALICIOUS

PDF

78.8 KB Created: 2021-04-30 10:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 180bf9aed12d0d800732b3e447a95c4f SHA-1: 808dfc78dfaddcae9a812ea293bd1aa9592dc4aa SHA-256: f1c951b84fe16aa21049e91d0e3436378ba1bc20748311bc292e2a51ddedfe9e
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains and employing UTM parameters, strongly suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains references to wkhtmltopdf and Qt, indicating it was likely generated programmatically to host these links.

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://botokaw.ru/strik?utm_term=bell+hooks+feminist+theory+from+margin+to+center+pdf PDF link annotation
    • http://easy-money-cash.space/bts_idol_mp3_downloadr5rey.pdfIn PDF document text
    • http://predouche.xyz/second_language_acquisition_theories_pptfs1z8.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzededoz/tLvZ0if/road_riot_hack_mod_apk_download.pdfIn PDF document text
    • https://lobusejorul.weebly.com/uploads/1/3/5/3/135338183/ad9ea73.pdfIn PDF document text
    • https://ropadapolope.weebly.com/uploads/1/3/0/9/130969983/1375336.pdfIn PDF document text
    • http://evgeniy-semenenko.ru/troy_bilt_pony_will_not_startqn7uh.pdfIn PDF document text
    • https://cdn.sqhk.co/jedugifaxido/fktOhcS/trap_adventure_3_apk_mod.pdfIn PDF document text
    • http://in-step.shop/how_to_reset_my_bose_remote_controljnwkg.pdfIn PDF document text
    • https://likizosuzi.weebly.com/uploads/1/3/4/8/134886942/2d2ac9709e8be94.pdfIn PDF document text
    • http://hhizmet.com/merunawimucjpuz.pdfIn PDF document text
    • https://mejodedasebedo.weebly.com/uploads/1/3/4/7/134725949/6426073.pdfIn PDF document text
    • https://vinaxana.weebly.com/uploads/1/3/4/7/134725794/9af97f731cf.pdfIn PDF document text
    • http://fitness1.space/whistle_song_kill_billrv9mz.pdfIn PDF document text
    • https://balolenitazir.weebly.com/uploads/1/3/1/0/131071159/692c5.pdfIn PDF document text
    • https://cdn.sqhk.co/jekunesoru/igiidhi/earl_of_sandwich_disney_springs_gluten_free.pdfIn PDF document text
    • http://cancandance.org/guess_the_movie_answers_level_3vemjs.pdfIn PDF document text
    • http://reduslim-italy.site/frayer_model_vocabulary_templateqs8j5.pdfIn PDF document text
    • https://cdn.sqhk.co/remezebona/jevjcje/vubigifene.pdfIn PDF document text
    • http://helplnstagramcontact6088756.com/jevakipuceshr.pdfIn PDF document text
    • http://fortuneo.best/98742946590w925b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A9 5784 bytes
SHA-256: bc268defe72d5c124ed6e43055d16d83b748815014d45f8346dc98a6bbd77176
font_01_sfnt_off0001063f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063F 11588 bytes
SHA-256: afaabbb216b6d853f247e1903386f8aa59c9cef1d56f7c7be32f91b321b289cb

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