Malicious PDF — malware analysis report

Static analysis result for SHA-256 45cb24d72bb41d5b…

MALICIOUS

PDF

97.6 KB Created: 2021-03-14 17:24:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c2f4d2d5ee691e1599169114204ef6c7 SHA-1: 97c8282ca8c68929fc4948dfada17dba4953a4fe SHA-256: 45cb24d72bb41d5b4abaeec4e935d59c755db827b7d98d3073f113a668adfe24
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 0.9997

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://kuzutuzo.ru/strik?utm_term=sound+blaster+z+settings+for+gaming PDF link annotation
    • http://straponartist.com/how_to_add_social_buttons_in_wix483mx.pdfIn PDF document text
    • https://cdn.sqhk.co/voduzetefir/hhiaMSb/49592429666.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/hlO0hhc/funny_hashtag_generator_free.pdfIn PDF document text
    • http://sijemogezabusa.sportsontheweb.net/xipubelesodubevi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380680/normal_6041fe8915207.pdfIn PDF document text
    • http://static-get.top/12936028499n5e3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409616/normal_5fe73874b0617.pdfIn PDF document text
    • http://regsenatvumen.website/ronaxidinufobizobilai7jh.pdfIn PDF document text
    • http://vigastlens.xyz/the_one_minute_manager_review0sz7e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d677b961-3ff2-487b-a841-1d6ab525f8e4/37379841726.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b432204-f7bd-480f-844f-187a835e8b94/artemis_fowl_book_3_audiobook_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/469274ca-077d-4bd0-9889-d0e6e34db7e3/bissell_proheat_12_amp_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/nixokepuvejadelapusu.pdfIn PDF document text
    • http://fatavetotujel.onlinewebshop.net/acceptable_risk_robin_cook.pdfIn PDF document text
    • https://s3.amazonaws.com/midipes/a_to_z_south_full_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc2f06f3-fb3b-4227-a08f-ec52565ca7a0/kixajutajifusimajamepotoj.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_off000134a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A1 5520 bytes
SHA-256: d6114e946cfcbc513e61eb12762efa71a140bf6fab2817758defdb7b4a87912a
font_01_sfnt_off0001474f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1474F 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00014fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FDC 11656 bytes
SHA-256: b6cf4c858655c81f0e3580bd35fa7de91be1af2ff80d6e920ec2ac61ded87c66

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