Malicious PDF — malware analysis report

Static analysis result for SHA-256 d22d2c6385ca5dc5…

MALICIOUS

PDF

74.9 KB Created: 2021-03-04 16:52:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 0dc22301ba69ce3c17ef8b4dd7eda34f SHA-1: e3e548b2ff368fea770c65985e9d694fc4cdc73e SHA-256: d22d2c6385ca5dc57f57d4f5d1b5cdadb50fe73f5c74c777cc6de7878cac2589
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains numerous external URIs and embedded links, many pointing to disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains references to 'crossword quiz' and 'wkhtmltopdf', likely a lure to disguise the malicious nature of the links.

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://pelibifir.ru/wix?keyword=crossword+quiz+daily+january+5+2020 PDF link annotation
    • http://fartook.online/kubonunupebikupefemazouabr.pdfIn PDF document text
    • http://karaulovlife.site/sozusopizotuziwaginoxaxhk67.pdfIn PDF document text
    • https://cdn.sqhk.co/mofosalamo/8jbhija/26949320266.pdfIn PDF document text
    • http://lovewaits.ru/how_to_track_usps_certified_mail_receipt23z3k.pdfIn PDF document text
    • http://remontlegko.info/tavesulavezureganudaja0nlpc.pdfIn PDF document text
    • http://salestore.pro/xobesogepasomodipevuhgr4d.pdfIn PDF document text
    • http://dhl-order.info/17367153960o4m8h.pdfIn PDF document text
    • http://segaruzobuguses.scienceontheweb.net/the_road_cormac_mccarthy_movie_online.pdfIn PDF document text
    • http://5gusevshop.space/handy_heater_instruction_manualv22qt.pdfIn PDF document text
    • https://cdn.sqhk.co/vobipibomuk/5ha3jaG/ruzemoreva.pdfIn PDF document text
    • http://dimax-matrasy.ru/goterans1m9n.pdfIn PDF document text
    • http://filmera.ru/amc_stock_dividend_2019skt7h.pdfIn PDF document text
    • https://cdn.sqhk.co/butemobe/gLgHih2/x-_plore_file_manager_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/fetumamuv/69jjH5Z/45506179315.pdfIn PDF document text
    • https://cdn.sqhk.co/pibusupi/7LChbgi/magic_puzzle_quest_unlock_planeswalkers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/416cc2cf-8674-4d5e-b9ff-e95fd4c06cd0/traductor_ingles_espaol_tomando_foto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c50489e-7e7c-48a6-9d03-d820c9f63666/how_to_fix_a_dvd_that_wont_play.pdfIn PDF document text
    • http://lufevexos.atwebpages.com/how_to_plant_potatoes_in_my_garden.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a58f3646-14f2-4657-8f48-fdcfc26cfe5f/jj_smith_30_day_green_smoothie_for_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbfb71a1-4612-4f84-af3a-8b40992b0a20/14509754098.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52bb9732-0fce-47c3-835d-35b3a5adbeb1/how_to_make_a_bunk_bed_frame.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_off0000e815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE815 5568 bytes
SHA-256: 50905ced566f7d5bd7a256372e65eaaa8e2195b79be5014224b4478f02dfe3a4
font_01_sfnt_off0000fb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB33 10276 bytes
SHA-256: 4e943b9fd4f1b7be7495b2083f233bd2f82ffd0eac9ffcdd5ca2a79541699d75

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