Malicious PDF — malware analysis report

Static analysis result for SHA-256 800971a0b1831d26…

MALICIOUS

PDF

83.6 KB Created: 2021-05-11 13:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff8931cda28d7c2084276dd0bea9df37 SHA-1: e04229a24ff13acd1ecccdc0bcc440b5f79d831c SHA-256: 800971a0b1831d26767334159c11dd6b81230bd770eabc25c4905d8e60d0cc20
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The PDF_SEO_LINK_FARM heuristic identified a mass of external links, with the primary one being a link farm hosted on cdn.sqhk.co. The presence of embedded URLs and the PDF_URI heuristic further confirm the attempt to redirect users to external malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jumiwimov.ru/strik?utm_term=magic+chef+rv+stove+manual
    • https://cdn.sqhk.co/zejizoguzut/oSIhdhd/the_sims_castaway_cheats_ps2.pdf
    • https://cdn.sqhk.co/nogorodizet/9elzjj0/free_sound_level_meter_app_for_pc.pdf
    • https://cdn.sqhk.co/libavesonon/ibighdo/jolamowokivudijamasajonaj.pdf
    • https://cdn.sqhk.co/moxofudifafi/gfhhJ8i/airpay_payment_gateway_integration_in_android.pdf
    • https://cdn.sqhk.co/pumibavi/hHhoghz/xosesesopaf.pdf
    • https://cdn-cms.f-static.net/uploads/4408462/normal_60479d227bc8d.pdf
    • https://cdn-cms.f-static.net/uploads/4383913/normal_600c4ba00b1b2.pdf
    • https://static.s123-cdn-static.com/uploads/4470532/normal_60046de050046.pdf
    • https://cdn.sqhk.co/tipefimex/UCgighh/6100673381.pdf
    • http://tamarone.22web.org/how_much_money_does_an_entry_level_graphic_designer_make.pdf
    • https://cdn-cms.f-static.net/uploads/4484834/normal_5fd1ef8b536cb.pdf
    • https://cdn.sqhk.co/ramawuvade/Izjd6Sp/slots_deluxe_free_slots_casino_slot_machines_pc.pdf
    • https://cdn-cms.f-static.net/uploads/4490936/normal_5fdacec8da157.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jixojeripe.rf.gd/24902832374.pdf
    • http://xijixabomama.rf.gd/new_albums_2019.pdf
    • https://uploads.strikinglycdn.com/files/bf2d3807-8b95-49e7-8ab9-292831129a0b/infinity_war_thanos_snap_reaction.pdf
    • https://74269c25-1731-4359-90d4-804f54ef9c1c.filesusr.com/ugd/b5973a_901beaea5b164152af2fee38b713546e.pdf?index=true
    • http://wizebefekeb.epizy.com/81802106316.pdf
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_36aa51c00bb343a6bf6c50be00bb7a75.pdf?index=true
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_ae4622dcbb72423badd647ea629529a6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9f3ff9e0-dc7f-4d40-b908-e0fd99d6fb68/38071505968.pdf
    • https://uploads.strikinglycdn.com/files/68df57d9-53d3-4b6e-89fb-e2cce97f77a6/66_printable_books_of_the_bible_summary_sheets.pdf
    • http://zixadadafupeg.epizy.com/free_monthly_maintenance_report_template.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_off0001080c.bin
1de35fd3346e69d36c19cdfe5adf55b12e3fac9049f3ad8337b767d24706bde2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1080C 5360 bytes
font_01_sfnt_off00011a3b.bin
55288ae02aedbbb934ee1084fae8f47e00734c9a4bd137c5201aaafa79778f81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3B 11488 bytes

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