Malicious PDF — malware analysis report

Static analysis result for SHA-256 345c9741019d7ca9…

MALICIOUS

PDF

90.8 KB Created: 2021-04-07 06:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: fd95ab8dbf795815c31af944deefbd24 SHA-1: e86c8e1713e981dd293534c9248a9cb240324665 SHA-256: 345c9741019d7ca9c5afbd9c715f221f0a669ced9c768dd42dae16803f8e7630
134 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on disposable domains, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious lure designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=wondershare+pdf+editor+kuyhaa PDF link annotation
    • https://cdn.sqhk.co/tinawegu/bmbtHhc/senujux.pdfIn PDF document text
    • http://lizixute.iblogger.org/bulleya_sultan_song_ringtone.pdfIn PDF document text
    • http://balonedud.iblogger.org/25529656221.pdfIn PDF document text
    • https://cdn.sqhk.co/rurufimibiwe/pcLiaSa/japanipi.pdfIn PDF document text
    • http://kiwenalod.medianewsonline.com/digital_photography_complete_course_by_dk_publishing.pdfIn PDF document text
    • https://cdn.sqhk.co/walamalesumi/hdYFwie/91336221078.pdfIn PDF document text
    • https://cdn.sqhk.co/nozelezinofa/7giiaZS/pixafifuzunu.pdfIn PDF document text
    • http://tanijijud.sportsontheweb.net/bilan.pdfIn PDF document text
    • https://cdn.sqhk.co/vexagajezesa/hjmSUhe/41197942643.pdfIn PDF document text
    • http://rifubabesepa.iblogger.org/basketry_merit_badge_pamphlet.pdfIn PDF document text
    • https://cdn.sqhk.co/rajunakeb/geSihhi/zombie_cube_2_download_ios.pdfIn PDF document text
    • http://zisapawiwako.mypressonline.com/chain_of_custody_evidence.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ruxuvejefo.epizy.com/alternatives_to_gmail_app_android.pdfIn PDF document text
    • http://sunuwib.epizy.com/fapulupoboluwenepamujire.pdfIn PDF document text
    • http://genolewedusu.myartsonline.com/fresh_kitchen_catering.pdfIn PDF document text
    • http://dusegakalo.epizy.com/81158697197.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e4f7545-df01-4079-a21f-0fadc78af8bd/29865888692.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be6ce8e4-e2e8-410e-ae03-ba3452444476/brother_p_touch_edge_label_maker_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/843bb108-570f-4726-bc2a-c2d886b29b61/how_to_enter_recovery_mode_iphone_4s_without_home_button.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a28b4c57-ff1b-4e81-a030-85dde323aec5/what_does_operations_research_analyst_do.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/762f30ef-ae32-41b7-8e3f-9a9149c2447b/surefajimezo.pdfIn PDF document text
    • http://suduxegowur.onlinewebshop.net/49318632710.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_off000123eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EB 5276 bytes
SHA-256: b0a0fbe37c944b8d61b21580e37514428a900bebc5b1cc4108446b61b440d1ea
font_01_sfnt_off000135ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135EE 12152 bytes
SHA-256: e5499214022fef4594c33cea178bc825f04240c0d49d34c7f2040f52831d387a

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