Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d1231eeea5c0b29…

MALICIOUS

PDF

83.5 KB Created: 2021-03-23 06:19:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b440e923f5c47b1a94e94a8edc49ebf4 SHA-1: 95ea62ca5fac9de42e1a1a4003d82095213150f9 SHA-256: 7d1231eeea5c0b29de09cbe31b8d864547b42fbc243b428f6974ec41557c4943
126 Risk Score

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 0.9998

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
  • 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://lozipotod.ru/123?utm_term=windows+update+assistant++location PDF link annotation
    • https://cdn.sqhk.co/pulovafafita/cggwibJ/wejaxizonipomopefevul.pdfIn PDF document text
    • http://lafefutom.iblogger.org/pencil_sketch_tutorial_free_download.pdfIn PDF document text
    • http://gesetaxoxu.sportsontheweb.net/apprendre__dessiner__la_japonaise.pdfIn PDF document text
    • https://cdn.sqhk.co/xupumekejaxa/bmgjhd1/you_have_a_text_message_female_voice_ringtone.pdfIn PDF document text
    • http://medilawibume.scienceontheweb.net/recommendation_letter_sample_for_student.pdfIn PDF document text
    • http://stavki.link/59754743817k0on.pdfIn PDF document text
    • http://lorakuze.sportsontheweb.net/sociolinguistics_peter_trudgill.pdfIn PDF document text
    • http://pr-bux.online/jutidexumokadadudoayrgt.pdfIn PDF document text
    • https://cdn.sqhk.co/torujazelome/hiv4rgh/islands_menu_gluten_free.pdfIn PDF document text
    • http://creditstar-kabinet.com/oceanhorn_apk_data_full3cbg3.pdfIn PDF document text
    • http://idealica-uficiale.website/my_cloud_ex2_ultra_setup_softwarewghdy.pdfIn PDF document text
    • http://fanuvazav.scienceontheweb.net/disney_princesses_colouring_pages.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://dolifusekaxug.epizy.com/60685521416.pdfIn PDF document text
    • http://manepuw.rf.gd/big_nate_comic_strip_first_class.pdfIn PDF document text
    • http://fiderifi.rf.gd/13154289799.pdfIn PDF document text
    • http://miduzusajaveg.rf.gd/kodaline_moving_on_piano_sheet_music.pdfIn PDF document text
    • http://legokejapo.atwebpages.com/90389073442.pdfIn PDF document text
    • http://fututajadijet.epizy.com/entrepreneurship_in_thailand.pdfIn PDF document text
    • http://zusunikumejimet.rf.gd/79535481007.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_off0000f930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF930 4960 bytes
SHA-256: 9f3cc5b4beb9fca26d1fe388478c6fceab0c0b7df163f63e119e860cf9abeccc
font_01_sfnt_off00010a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A32 11268 bytes
SHA-256: ac564e651d5b998764fbc8f3fa42e05885fa418508d7ad24c43154e0d33920fd
font_02_sfnt_off000130a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A4 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34