Malicious PDF — malware analysis report

Static analysis result for SHA-256 b603c646a2deff67…

MALICIOUS

PDF

64.8 KB Created: 2021-01-10 23:16:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d8e13e983c60d53c55751d17da90de75 SHA-1: 2bccc121db335476e3285e26ab335a5a8c2041f4 SHA-256: b603c646a2deff67c9ca179e70831b886686123191c50b151c19c7671cb35856
184 Risk Score

Malware Insights

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

This PDF document contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure as a link farm on disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=1500+x+120 In PDF document text
    • https://cdn.sqhk.co/benibavagoge/kkgehjb/roblox_ban_hammer_simulator_codes_wiki.pdfIn PDF document text
    • https://repafajekojila.weebly.com/uploads/1/3/4/3/134305679/2331898.pdfIn PDF document text
    • https://cdn.sqhk.co/tufuboloruj/rljaIjj/how_do_you_spell_the_wrong_buzzer_sound.pdfIn PDF document text
    • https://tizupokewa.weebly.com/uploads/1/3/4/0/134013062/jidizozegad.pdfIn PDF document text
    • https://xatotaga.weebly.com/uploads/1/3/4/7/134726025/66285da413f853.pdfIn PDF document text
    • https://mexejafulid.weebly.com/uploads/1/3/4/8/134880369/nixami.pdfIn PDF document text
    • https://kufojomarolov.weebly.com/uploads/1/3/4/4/134401526/c66271b0.pdfIn PDF document text
    • https://cdn.sqhk.co/wimakebibane/36hqmIW/35939956804.pdfIn PDF document text
    • https://site-1176079.mozfiles.com/files/1176079/zunekepodinot.pdfIn PDF document text
    • https://vikisoxez.weebly.com/uploads/1/3/4/7/134712259/3b5b33df65b.pdfIn PDF document text
    • https://cdn.sqhk.co/dusimefosix/7h8Huha/94905983402.pdfIn PDF document text
    • https://cdn.sqhk.co/nutanujel/djfszZV/kings_island_game_card_balance_checker.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/91093485029.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/klondike_solitaire_green_felt_games.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/kelpy_g_sheet_music_trombone.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_off0000c002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC002 4588 bytes
SHA-256: 9053d6071f82eeac6911dc5ccb49d584f54947534b2951722d1db5e4a5004eb1
font_01_sfnt_off0000cfc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC8 11608 bytes
SHA-256: 061e2fed606bed19507d9f06cdc188553153d62596a9cb9df43baabda6166c86

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