Malicious PDF — malware analysis report

Static analysis result for SHA-256 5591e55648098f96…

MALICIOUS

PDF

68.5 KB Created: 2021-04-20 11:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: b931ef4f8a1cebdaafd94e0abf1d35fe SHA-1: eb61461d3d55a40620831b4f362b1e2aea2fb196 SHA-256: 5591e55648098f967f72f609b01ffc310460f323ddbf49652a40f163f8b87835
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous external URIs on disposable domains, including the primary IOC 'https://jumiwimov.ru/strik'. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jumiwimov.ru/strik?utm_term=does+cfa+teach+financial+modelling PDF link annotation
    • http://figopevevalid.iblogger.org/81769827580.pdfIn PDF document text
    • http://tameenegypt.com/62208046559t2ewe.pdfIn PDF document text
    • http://lujadexezusunam.22web.org/dilokavetuzevinibizovov.pdfIn PDF document text
    • http://muvepifare.mygamesonline.org/vogemadivetaferiz.pdfIn PDF document text
    • http://driveformclanemilwaukee.com/kokilaben_dhirubhai_ambani_hospital_reports_portal5r20c.pdfIn PDF document text
    • http://bimonetejatoleb.mygamesonline.org/55401496799.pdfIn PDF document text
    • https://sekitajed.weebly.com/uploads/1/3/1/3/131383533/33484.pdfIn PDF document text
    • http://kopaburak.sportsontheweb.net/79741379661.pdfIn PDF document text
    • http://videohost.space/universal_ethical_principlesob6v1.pdfIn PDF document text
    • http://wivevadevenumet.mywebcommunity.org/cancer_de_colon_recto_y_ano.pdfIn PDF document text
    • https://xogoluxoso.weebly.com/uploads/1/3/4/4/134444279/5526876.pdfIn PDF document text
    • http://vojemodipu.sportsontheweb.net/nazigidufokazujipeferib.pdfIn PDF document text
    • http://reduslim-official.website/haderax_the_invincible_solo_guidejgwho.pdfIn PDF document text
    • http://fudoviwil.mywebcommunity.org/introduction_to_heat_transfer_frank_p_incropera_solutions.pdfIn PDF document text
    • http://vitetiw.getenjoyment.net/ayushman_bharat_yojana_in_english.pdfIn PDF document text
    • http://leoidet.xyz/university_of_minnesota_apas_report27fd3.pdfIn PDF document text
    • http://sipataj.sportsontheweb.net/6320780994.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/fc3eea73-6cc1-493d-aeb9-7d1e6e2309fc/gimugumamowubapubugazuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/613bfbad-eff9-4ef7-8c27-502cd43af108/the_man_in_the_high_castle_ending_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/612d307f-e9ba-4ea9-a73f-900c7dbca1e9/welifazumokowekesov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d662498-e710-4f7a-b970-caf0cd4dbde4/how_do_you_set_a_grandmother_clock.pdfIn PDF document text
    • http://foxukekamusun.onlinewebshop.net/6239627204.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC558 5124 bytes
SHA-256: e371eb71d4b5849e7595070bbdefa2bd6d177639f00722fa446927f0fd0328ef
font_01_sfnt_off0000d697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD697 9300 bytes
SHA-256: 3bc41ba266e6ea3ad5d0a0059367f8d899643924a2d725499adc7fae781f1608
font_02_sfnt_off0000f66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66D 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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