Malicious PDF — malware analysis report

Static analysis result for SHA-256 f24006e428bc1c82…

MALICIOUS

PDF

90.0 KB Created: 2021-05-04 09:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a88d82bf105c7b7007fc6a37dcc77cf3 SHA-1: 2e3734174d98bc41f16101f0de410ce8c01cae19 SHA-256: f24006e428bc1c827bfecd46c83f6ecd5d257a046b35e078f0beae5ee2ca606a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm designed for SEO manipulation. ClamAV and ML classifiers also identify it as malicious, specifically as a phishing trojan. The presence of external URIs and the nature of the heuristics strongly suggest this document is intended to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=mr+heater+big+maxx+80000+btu+propane+consumption PDF link annotation
    • http://naxajogilelog.medianewsonline.com/char_broil_the_big_easy_oil_less_propane_turkey_fryer_recipes.pdfIn PDF document text
    • http://sportplays.ru/83110147887brjfa.pdfIn PDF document text
    • https://cdn.sqhk.co/bixedazofas/jghhcgj/dormant_company_financial_statements_template.pdfIn PDF document text
    • https://cdn.sqhk.co/gajamomol/fichgic/runarikirewavob.pdfIn PDF document text
    • http://amorexpo.com/1827777871816j03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465548/normal_602b9b3247297.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392854/normal_606c0e18da307.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/ji512ii/blockman_go_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/kubafipefo/jfhjjhT/nuclear_fission_vs_nuclear_fusion_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/risevejuxik/Lybiigj/42040403869.pdfIn PDF document text
    • http://ig-soft-team.com/chocolate_milkshake_ninja_recipeucuo1.pdfIn PDF document text
    • https://cdn.sqhk.co/zevolazezag/whcVjaG/titanium_white_meteor_storm_price_ps4.pdfIn PDF document text
    • https://cdn.sqhk.co/bitanalagep/gdhjMic/10008762419.pdfIn PDF document text
    • http://static-start.top/audi_s4_avant_gebrauchtwagenhqghj.pdfIn PDF document text
    • https://cdn.sqhk.co/zarejesorufo/fM3idgi/ultrasound_guided_thyroid_biopsy_cost.pdfIn PDF document text
    • https://cdn.sqhk.co/navuwamas/jihgMbe/xoremapokolujowavowaze.pdfIn PDF document text
    • https://cdn.sqhk.co/joraxeneli/c3hgWVE/home_gym_assembly_services.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408471/normal_60405c2326295.pdfIn PDF document text
    • http://podcard2020.site/7059976134akxnk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zisukuvi.atwebpages.com/carpetbaggers_harold_robbins.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d0a903a-e19c-47c3-9807-9f1230c8bf41/83424894808.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2faf534-57a2-4d2e-a46d-3b82c8e41d0d/is_2018_dodge_durango_a_good_car.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f3230e8-b3e2-4adf-987c-a6c5d911baa2/brandy_cinderella_2021.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_off000121eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EB 5864 bytes
SHA-256: 99befa37f6216606d63958345a19a046ff9de78ebfb22687d37b01e8d4032a94
font_01_sfnt_off000135be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135BE 10752 bytes
SHA-256: 06ee2bf9f73e7a2393f6679e71c30a6a3ac319cc4684951653e234ee9c423aa6