Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4bc22d405c1d613…

MALICIOUS

PDF

70.4 KB Created: 2021-03-03 12:20:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a3494bf3c7a652df3855ed680cf8591e SHA-1: 26c721a7a51f43bfc07d9f9eadc31244cd1c7cee SHA-256: a4bc22d405c1d6136ac6db3a9e0b665fa540c4507d7f20c3b86edfb7a756a03b
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an embedded URL pointing to 'fokemale.ru', which is likely used to host malicious content or redirect to a phishing site. The document body, though heavily obfuscated, contains fragments suggesting it's a lure, possibly related to economic concepts, to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/strik?utm_term=which+of+the+following+statements+is+not+correct+monopolies+are+socially+inefficient+because+they PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369626/normal_601e4b6a98661.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411922/normal_5ffd6f78ab98c.pdfIn PDF document text
    • http://bitejodimoni.iblogger.org/gimufutiloxixerizuzena.pdfIn PDF document text
    • https://cdn.sqhk.co/dojopaxitovi/ifjc1UV/playhouse_plans_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/pajokiman/8hbgihi/gear_shift_moves_but_car_won_t_drive.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/gcoihoI/dominos_coupon_2020_october.pdfIn PDF document text
    • https://cdn.sqhk.co/kixikeli/fidqjex/fafudipobivodekebinuzej.pdfIn PDF document text
    • https://cdn.sqhk.co/lekibefefu/Cjeijwq/tewomonava.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371266/normal_6013db68c9c7e.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisitixinu/Igihjhg/color_crush_planner_inserts.pdfIn PDF document text
    • http://vugijow.iblogger.org/31343855767.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/hhkhahb/cheapest_direct_flights_from_london_to_san_francisco.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392210/normal_60057e9e802a4.pdfIn PDF document text
    • https://cdn.sqhk.co/podogule/VnicgcY/cotton_candy_ice_cream_sandwich_fair.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/mubefula/equipment_loan_agreement_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/falikedule.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/naruto_shippuden_skip_filler_guide.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_off0000d3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E2 5776 bytes
SHA-256: 087b249fd093e3f10676d9f15b5ff1085889cbf0b89f4c03e092fcf9a8e7c813
font_01_sfnt_off0000e78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78F 10628 bytes
SHA-256: dc89d68b6941415559fc649bdc9b3227119513a0f3030b4e04157c0aeb3eab36

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