Malicious PDF — malware analysis report

Static analysis result for SHA-256 af9b75cd57f55c41…

MALICIOUS

PDF

71.8 KB Created: 2021-03-29 19:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c5da254202bef9b177a3d1ce77be66bd SHA-1: 9ce57158b87bef7612031fee09fba695787e3f7c SHA-256: af9b75cd57f55c41c44c46fab1e23e54d3cb2b6f208d0960307cd6befdc622ca
134 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dafemum.ru/strik?utm_term=magnum+energy+me-arc+inverter+remote PDF link annotation
    • https://cdn.sqhk.co/jemowevu/NgfOQwP/19848655091.pdfIn PDF document text
    • http://vivudanu.scienceontheweb.net/process_costing_solved_examples.pdfIn PDF document text
    • http://remastacer.com/again_i_say_rejoice_chords47z9m.pdfIn PDF document text
    • https://cdn.sqhk.co/lusesito/foDgfhe/26049688605.pdfIn PDF document text
    • http://classkaod.ru/techno_gears_marble_mania_mega_instructionstdj17.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/sansa_clip_4gb_firmware_update.pdfIn PDF document text
    • http://getakabawi.22web.org/jigepudokawuw.pdfIn PDF document text
    • http://vowewudimo.mypressonline.com/babugibuva.pdfIn PDF document text
    • http://idealica-official-it.website/bearnaise_er_dyrenes_konge_rom_guide7hq8u.pdfIn PDF document text
    • https://cdn.sqhk.co/zezetemirag/GhbMbie/parent_portal_login_page.pdfIn PDF document text
    • http://normal-id.com/wim_hof_method_amazon_ukczxww.pdfIn PDF document text
    • http://luvuzerosotavu.iblogger.org/xinuz.pdfIn PDF document text
    • http://tameeniraq.com/80494736091zxn8d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://najukelosuned.myartsonline.com/when_i_was_young_in_the_mountains_reading_rainbow_episode.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/java_tutorial_for_beginners_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23b3b664-50c0-4543-b252-86f6a86ae4e2/list_of_senior_management_job_titles.pdfIn PDF document text
    • http://xuxerutiwuv.onlinewebshop.net/el_pentateuco_pablo_hoff_completo_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/9080262564.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34d0b0fa-0f9a-4186-8b1f-2dff6a943bfc/tafazelozubixosafaliv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5457c114-adf6-4031-8100-d8c4fb092300/cylinder_volume_word_problems_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/fannie_mae_freddie_mac_loan_modification_guidelines.pdfIn PDF document text
    • http://vosikixu.rf.gd/physical_and_chemical_properties_of_amines.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_off0000dcf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF0 5108 bytes
SHA-256: 48e3e1b90e8bfab27fd1f478482e905ac5f115155b81eeed7f23a4f5a7b227dc
font_01_sfnt_off0000ee60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE60 10340 bytes
SHA-256: ae0ffd01d01cfbb86d1488ed3372c1db050559bae41ac8dcf9553823e5cbe390

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