Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f4800f1a0807558…

MALICIOUS

PDF

79.6 KB Created: 2021-04-16 11:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 54959d3aa799031c2011173fe5b776ec SHA-1: 83f5bd0e9ddb0eed9df36f45f5c1a404bc3314f0 SHA-256: 8f4800f1a080755857b0f8407a9b92f6dd8d4fea2cc0580892b93ffebcd7c47a
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • 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://xezojetit.ru/strik?utm_term=shadowhunters+the+mortal+instruments+series+cast PDF link annotation
    • http://d-youtube.com/79913153799fc7g0.pdfIn PDF document text
    • http://cardioactiveuficiale.site/87200574173q327k.pdfIn PDF document text
    • http://tusiteguluvora.getenjoyment.net/abb_ability_edcs.pdfIn PDF document text
    • http://just-gopro.com/how_to_make_journal_1_gravity_fallsghmma.pdfIn PDF document text
    • http://ch-redirect.icu/pokemon_planet_shiny_hackhz1ya.pdfIn PDF document text
    • http://vegunax.getenjoyment.net/zhang_ailing_sealed_off.pdfIn PDF document text
    • http://vuzeliligovitu.iblogger.org/jerry_alan_johnson_bagua.pdfIn PDF document text
    • http://powerpoint4you.ru/pexomokatarobubupodu1oopp.pdfIn PDF document text
    • http://lipuwisapi.mywebcommunity.org/onn_digital_alarm_clock_radio_how_to_set_alarm.pdfIn PDF document text
    • http://studyweb.site/zibuvawjpsbi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0b7b936c-93ac-4a60-9644-6ba220b934cc.filesusr.com/ugd/b4bf80_6115ea2bf3714bc1a61c1ae106f5b884.pdf?index=trueIn PDF document text
    • http://runaredikulenin.epizy.com/bruce_h_lipton_biology_of_belief.pdfIn PDF document text
    • http://bojonovaja.rf.gd/lazugefolazuke.pdfIn PDF document text
    • https://c538924d-9290-4e35-808b-5013ecaac822.filesusr.com/ugd/047ea9_5996713d340d492ca496e16a591b02c0.pdf?index=trueIn PDF document text
    • http://pevurevakube.rf.gd/whatsapp_for_windows_8._1_phone.pdfIn PDF document text
    • http://vekozabebulufav.rf.gd/namaz_translation_in_urdu_and_english.pdfIn PDF document text
    • http://naxesabefadufu.atwebpages.com/vaxobita.pdfIn PDF document text
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_cf34b4f9fc37423a8f3c18540cc1bb48.pdf?index=trueIn PDF document text
    • http://poziluxolebulu.epizy.com/japokizilutokuronodud.pdfIn PDF document text
    • https://926da24b-d3df-4aea-ac1b-ebdf7359a9e7.filesusr.com/ugd/fef925_663653cdd5f44603a389319df57a14c3.pdf?index=trueIn PDF document text
    • http://bebukoruwuru.epizy.com/tutorialspoint_c_programming_version.pdfIn PDF document text
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_13130b289cc14f9a93967e8f3d7b641f.pdf?index=trueIn 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_off0000f79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79A 5372 bytes
SHA-256: 598631a133a9ede5e2ad7d87b4358e90838d98cee4f98c581c3d27467266f1af
font_01_sfnt_off000109c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C6 11276 bytes
SHA-256: 31fa842d795fec9e7e877938a10a95ebf061d87bda859b92f6067a60816bbb84

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