Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4938abc26019413…

MALICIOUS

PDF

81.1 KB Created: 2021-05-09 05:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9c4e0f5ad178ac515a0cf140b301381d SHA-1: 70409e646c956e29cef55fc8071c9682b6e16322 SHA-256: d4938abc26019413957f610a8c15c2db2abaa22107bb1b5cbccd242e53f721d3
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/strik?utm_term=the+hiding+place+summary+chapter+5 PDF link annotation
    • https://bifukumuvu.weebly.com/uploads/1/3/5/3/135347201/4792881.pdfIn PDF document text
    • https://cdn.sqhk.co/zetuzire/jiibPhR/instagram_search_engine_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/wufotubi/Vbmiehe/3701683278.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/9Qjechh/widafexiwufefemixufagi.pdfIn PDF document text
    • https://cdn.sqhk.co/lasesekov/dlajasW/ginger_keyboard_emoji_gifs_themes_games.pdfIn PDF document text
    • https://lafakizivubev.weebly.com/uploads/1/3/4/7/134767266/mavipixumazox.pdfIn PDF document text
    • http://malolufixanovas.sportsontheweb.net/pudejuvufasenivizo.pdfIn PDF document text
    • https://sovufejado.weebly.com/uploads/1/3/0/7/130740048/3138070.pdfIn PDF document text
    • https://cdn.sqhk.co/xizemeginu/L7zijgj/basketball_3d_shooting_game.pdfIn PDF document text
    • http://vatetuda.scienceontheweb.net/kofupo.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/nefagolom/zotowazek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c13d9b1-9124-409c-ae5b-651fc0cc1781/do_you_want_to_be_average_blood_pressure_readings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30b03aee-b259-418c-93b1-d43b48008200/43100835643.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e72e5866-857d-4fd5-be7d-ebc40d6c64f1/casio_ctk_7200_keyboard_price.pdfIn PDF document text
    • http://fazaburifug.myartsonline.com/gapexoxolibi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bb3f29b-6b52-41eb-9661-5da8fd2177dc/nobezopetapateruravunel.pdfIn PDF document text
    • https://s3.amazonaws.com/wizakokowe/pablo_neruda_poems_in_spanish_and_english.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/choral_warm_ups_with_movement.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE20 5664 bytes
SHA-256: 0e94e4a29c79d8dca9da9a8dd05b0d7dedccb8362d159d006fa9fe1941e9ecf0
font_01_sfnt_off00011142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11142 11800 bytes
SHA-256: 77b37e5d3a99b2bf164725a30a9bfe4a8c330946398c802f3c0805ef61e78d93

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