Malicious PDF — malware analysis report

Static analysis result for SHA-256 8104deb48b5e9c47…

MALICIOUS

PDF

84.9 KB Created: 2021-04-29 19:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: bed6155c23b2a59c61d92c14f2fe9e77 SHA-1: 5ba48d755cf92d56a7898d05755e751fc7628b92 SHA-256: 8104deb48b5e9c47f6bf880bf97427baae282489824f251d832d1747c45b6b05
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous disposable hosting domains. The embedded URLs and the document body, despite being heavily obfuscated, point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://zajinet.ru/strik?utm_term=what+is+a+rainstorm+in+spanish PDF link annotation
    • http://raftgjgr.space/508919718266ctd8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424043/normal_5ffa3d78d6fdc.pdfIn PDF document text
    • https://falatunasozenu.weebly.com/uploads/1/3/4/7/134762474/6934888.pdfIn PDF document text
    • https://genaxixa.weebly.com/uploads/1/3/1/4/131437685/0e576bead.pdfIn PDF document text
    • https://fubediko.weebly.com/uploads/1/3/1/0/131070718/6694028.pdfIn PDF document text
    • https://zugozoriv.weebly.com/uploads/1/3/4/7/134770463/viwosuzutimujo_gixolojano_zelomefanij_gofolop.pdfIn PDF document text
    • http://tepifugamokeg.medianewsonline.com/52892074847.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/eLdhdPG/business_process_manager_microsoft_salary.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488314/normal_5ff281bf9ae4b.pdfIn PDF document text
    • http://banquepopulaire-fr.org/book_folding_templatesyjeqi.pdfIn PDF document text
    • https://cdn.sqhk.co/zavonufovi/jbjjtU9/84195631062.pdfIn PDF document text
    • http://fefiwizam.sportsontheweb.net/what_does_f21_mean_on_a_maytag_4000_series_washer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426967/normal_604f10e86cb9d.pdfIn PDF document text
    • http://rexonina.medianewsonline.com/how_to_be_interior_designer_without_degree.pdfIn PDF document text
    • http://100naturals.fun/what_is_heir_of_fire_aboutuxhok.pdfIn PDF document text
    • https://cdn.sqhk.co/naxupowu/gxZjahc/kapel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382414/normal_60645036b9d90.pdfIn PDF document text
    • https://cdn.sqhk.co/naludibeg/jan3uhh/human_fall_flat_free_for_chromebook.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465938/normal_605dd045e776b.pdfIn PDF document text
    • http://qlemelest.online/star_trek_enterprise_trip_and_tpol_mateaf1c1.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/8667336d-6d9a-48a2-8844-00126a5615ee/sony_wega_32_inch_tv_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6deb186-9648-4088-9a8d-caf4e07cc3e8/15405499389.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2d26e95-2526-401c-87e9-b4b876ed435d/zabika.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_off00010121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10121 4708 bytes
SHA-256: 15a2b1744e6ff394e5d1fb17742b0fd6536416b0a0e73523669a18b764819166
font_01_sfnt_off000110e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E8 11976 bytes
SHA-256: fae6a48b583d010c94be3ab80d5cfbfede86b20c668bf406a3d0387e3f0d7786
font_02_sfnt_off000137dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137DC 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361