Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c9f7f872d9841d…

MALICIOUS

PDF

66.7 KB Created: 2021-03-23 12:33:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fde93067b50ceca34f51761121a080ca SHA-1: 62227777799908b8c4ad982858a8eb328d8db719 SHA-256: 86c9f7f872d9841d12b1bd8fe13304d42d4e3a895f539ef1b2a4b6b5cf3f7a22
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8429

Heuristics 4

  • 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
  • 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://golowaki.ru/strik?utm_term=numerical+analysis+free+textbooks PDF link annotation
    • http://sesulup.iblogger.org/xezazusovidozodupivis.pdfIn PDF document text
    • http://vezerfa.xyz/walmart_grocery_promo_code_nov_2020trb1o.pdfIn PDF document text
    • http://lnstagramcopyrightmanagement.com/how_do_you_figure_michigan_child_support79vxi.pdfIn PDF document text
    • http://nokutanebufevon.iblogger.org/22475868186.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/ratixifo/74959208400.pdfIn PDF document text
    • http://rupewilalefapok.rf.gd/free_fire_evacuation_map_template.pdfIn PDF document text
    • http://wajiletum.epizy.com/kuragalakogagononezunerom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f5028c7-879a-46ba-a137-69ef72e7245f/where_can_you_learn_aramaic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbc68301-87f5-44a4-88b3-c0103b96490f/how_to_get_more_water_in_maytag_bravos_washer.pdfIn PDF document text
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_6f72a4bb0269404483104b14a993d4e5.pdf?index=trueIn PDF document text
    • https://20097937-9b7a-4da4-851c-33e9a8906939.filesusr.com/ugd/1e3518_eeced93cb29442ceb00036cad91e4f92.pdf?index=trueIn PDF document text
    • http://jurorinidup.rf.gd/56850008399.pdfIn PDF document text
    • http://jatujij.rf.gd/char_broil_commercial_series_4_burner_manual.pdfIn PDF document text
    • http://koxowasone.epizy.com/ratabu.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/sat_practice_test_3_answers_khan_academy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fd21c3a-a7d4-43e3-a151-0cc3c624e506/how_to_start_forex_exchange_business_in_india.pdfIn PDF document text
    • http://sobibuxasegisun.rf.gd/32551306192.pdfIn PDF document text
    • http://vevasog.epizy.com/tegotesavelosepajiko.pdfIn PDF document text
    • https://f72b89be-0fa6-41ee-8162-331329ef78ce.filesusr.com/ugd/95089d_afafd7c56be44b4e8a6c00f998403148.pdf?index=trueIn PDF document text
    • https://98350ace-7ac4-4f38-a9d9-579fdad8050b.filesusr.com/ugd/9b2d9b_73b5092c0da4429f8d7cc05d823fa245.pdf?index=trueIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE2 5368 bytes
SHA-256: f5f173c165c3b49c08855042ff527dd2ea74317f51a0b0ea2afa9698d09e6937

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