Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf1d749575dc26b…

MALICIOUS

PDF

75.8 KB Created: 2021-03-27 11:34:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8506070f06e7b87300a6f38b7f289c34 SHA-1: 6f6bf36556de68d9091a498bda7ef4eb48147b1e SHA-256: 1cf1d749575dc26b63993a4f3a0b927fd119b73e928b11f225d81a612d2fa935
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 as a link farm on disposable hosting. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and the nature of the URLs suggest an attempt to redirect users to malicious sites.

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://bologen.ru/award?keyword=behavioral+leadership+approach+pdf PDF link annotation
    • https://cdn.sqhk.co/dowusutitozi/DBijiiX/new_scrabble_2_word_fun_game.pdfIn PDF document text
    • http://hookup153.online/23569283311uwtzl.pdfIn PDF document text
    • http://discout.online/lidoxowisonanuwamghr9.pdfIn PDF document text
    • http://lukiduxipapep.mywebcommunity.org/bibliografia_estilo_vancouver.pdfIn PDF document text
    • https://cdn.sqhk.co/safubuguva/hjXibih/fall_starbucks_secret_menu.pdfIn PDF document text
    • http://boost-shop.xyz/how_to_restore_a_samsung_laptop_to_factory_settingsm2dz0.pdfIn PDF document text
    • http://pixxel.life/perimeter_worksheets_freent9jf.pdfIn PDF document text
    • https://cdn.sqhk.co/xotakuzazuf/jew7gj6/new_york_city_hotel_booking.pdfIn PDF document text
    • http://visionnew.xyz/wotajugovojegonixsmrm.pdfIn PDF document text
    • http://particuliers-societegenerale.xyz/how_to_crochet_a_blanket_with_chenille_chunky_yarnxyzyf.pdfIn PDF document text
    • http://like-store.site/48047354379730q6.pdfIn PDF document text
    • https://cdn.sqhk.co/bawivurolut/Omhhwig/tejexakatinukur.pdfIn PDF document text
    • https://cdn.sqhk.co/noviraxat/Aidhjij/kiss_of_war_add.pdfIn PDF document text
    • https://cdn.sqhk.co/kubepugemaki/uCLgejf/photo_studio_app_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/vozaxodep/jVMD1gd/wavefi.pdfIn PDF document text
    • http://wumewil.sportsontheweb.net/renaboxaxo.pdfIn PDF document text
    • http://save50it.info/how_to_pass_the_phr_exam_20180f39s.pdfIn PDF document text
    • https://cdn.sqhk.co/suxevevagova/uHjdhet/dragon_blaze_top_characters.pdfIn PDF document text
    • https://cdn.sqhk.co/videgogaf/y56icl7/woohoo_slots_play_free_casino_slot_machine_games.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/xuxifuzituwu/82475157337.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/gulalo.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_off0000eb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3D 5352 bytes
SHA-256: 5de0da0d1045ba19255291eddce5be110c10ca6646d494d31bf42fd928e10985
font_01_sfnt_off0000fd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD76 10736 bytes
SHA-256: 2d1e25757f3059f14a08ca9a1d57fc469ba2040e0b3dbd792758f6c6e20ba162

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