Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5c846a96dde99e…

MALICIOUS

PDF

78.0 KB Created: 2021-05-07 13:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 295d90d1a99f37a2356825522a4c29eb SHA-1: d9f794440c46e7a9a438e9c3fa8c55a9b374ed58 SHA-256: cf5c846a96dde99e8d8a4dd6658ec00fdbe6b842893db4145a4acc707b1b97e8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=is+verizon+phone+compatible+with+straight+talk PDF link annotation
    • http://vopibuxipem.22web.org/gulidotutopa.pdfIn PDF document text
    • https://cdn.sqhk.co/nojumuku/bCLzcif/lilinefemutopas.pdfIn PDF document text
    • http://luxibenuguk.getenjoyment.net/graphic_novel_blue_is_the_warmest_color.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxomawelej/IWgg3Yo/best_cooking_games_switch.pdfIn PDF document text
    • https://cdn.sqhk.co/muzedikerum/rqhfhrA/travelodge_near_chatsworth_house.pdfIn PDF document text
    • https://cdn.sqhk.co/waxipefimafa/tUSjg7s/the_great_debaters_movie_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407733/normal_60443e4ac4451.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445869/normal_60095a66abfc9.pdfIn PDF document text
    • https://cdn.sqhk.co/mikedeto/jibw3DN/playgo_gourmet_kitchen_appliances_sam_s_club.pdfIn PDF document text
    • http://lubenoredeji.mypressonline.com/63251695052.pdfIn PDF document text
    • http://dedotiroviwef.22web.org/pudeb.pdfIn PDF document text
    • http://xekalabaxuv.medianewsonline.com/simple_medical_fitness_certificate.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371497/normal_600a1f619981f.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
    • http://zexiwovo.epizy.com/sekokometedovuzup.pdfIn PDF document text
    • http://suvogiwuxibi.epizy.com/9233303019.pdfIn PDF document text
    • http://wozadubokurego.epizy.com/nela_ticket_all_songs.pdfIn PDF document text
    • http://divapikej.rf.gd/what_is_a_giant_molecular_structure.pdfIn PDF document text
    • http://pawupokativebak.rf.gd/xbox_360_controller_without_wireless_receiver_pc.pdfIn PDF document text
    • http://rojomiv.rf.gd/samsung_camcorder_hmx_f80_review.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_off0000e4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A2 5480 bytes
SHA-256: 57471bb37d40f5046962d7e936655c2047aa72dc8e50c567b39c438b5cc9cfaf
font_01_sfnt_off0000f725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF725 10824 bytes
SHA-256: 73074501895593c45bae705c0b7aaa0e0e4c1ee58f065002df98aba57456e859
font_02_sfnt_off00011bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF3 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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