Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf05aa85a6588911…

MALICIOUS

PDF

76.4 KB Created: 2021-04-02 11:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a3b3f704fe1ff941a0aae3fbbc02163d SHA-1: 99446243c4f0914f779b77adb09cd40cce7319da SHA-256: cf05aa85a658891165dc9a7edd36785ddca2280e9aafaea4ccb434c01aeac76f
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 0.9996

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://zajinet.ru/123?utm_term=feeling+good+muse+piano+sheet+music PDF link annotation
    • http://wujejejifi.mygamesonline.org/zagonatakuvogekaf.pdfIn PDF document text
    • https://cdn.sqhk.co/bofotabi/4GuQQjj/89598824310.pdfIn PDF document text
    • https://xirejefeju.weebly.com/uploads/1/3/4/7/134723985/5290919.pdfIn PDF document text
    • https://cdn.sqhk.co/modajili/0C5OEXQ/huey_helicopter_rides_florida.pdfIn PDF document text
    • https://didiseripipake.weebly.com/uploads/1/3/4/3/134344006/mipileku.pdfIn PDF document text
    • https://wixotavu.weebly.com/uploads/1/3/4/7/134764887/wifun.pdfIn PDF document text
    • http://bivozebavi.iblogger.org/answer_sheet_of_class_10_maths_ncert.pdfIn PDF document text
    • http://legendbilisim.com/ripexatufoj3hycj.pdfIn PDF document text
    • https://wokawopirajer.weebly.com/uploads/1/3/3/9/133999547/9076938.pdfIn PDF document text
    • http://lakegefufen.scienceontheweb.net/reacciones_quimicas_de_alcanos.pdfIn PDF document text
    • http://optamorem.com/1353785207wgzvl.pdfIn PDF document text
    • https://sefewazugep.weebly.com/uploads/1/3/5/2/135293251/ropubazel-guvolozituw-radod-numebidozegide.pdfIn PDF document text
    • http://tazanup.mypressonline.com/mezotumuj.pdfIn PDF document text
    • https://cdn.sqhk.co/xezakomujar/icFicia/renopulas.pdfIn PDF document text
    • http://katipef.medianewsonline.com/how_to_add_kwikset_to_z_wave.pdfIn PDF document text
    • https://cdn.sqhk.co/bidusowo/niihbLt/nagejazuxixepasu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lejiletuvasipib.onlinewebshop.net/citizen_eco_drive_radio_controlled_not_working.pdfIn PDF document text
    • http://vejabimumen.epizy.com/veggietales_the_best_christmas_gift_digital.pdfIn PDF document text
    • http://pimoxonevuwewax.atwebpages.com/idteck_access_control_system.pdfIn PDF document text
    • http://guxenubegipus.epizy.com/miocardiopatia_dilatada_congenita.pdfIn PDF document text
    • http://zikituxepori.epizy.com/18701322942.pdfIn PDF document text
    • http://wofavum.myartsonline.com/83811088330.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_off0000eb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB12 5344 bytes
SHA-256: b3291809b4067b0b68c87ef6344667a8584c6d7b57ff9b95f65c5bae508955d9
font_01_sfnt_off0000fd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD22 11812 bytes
SHA-256: 34d8cacf6ba07f30b98fc74708d773d1a23c35798559530a997810e44c26f3ef

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