Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f963e0357e39538…

MALICIOUS

PDF

74.3 KB Created: 2021-03-18 03:06:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 8c37ddc091edd227992e3bb378a9900d SHA-1: a1a61c9c0f28c9b0a7fb33cce9d17ac1bd59f34d SHA-256: 5f963e0357e39538163d2932808796cb339d5224aa31cf2cb7c6128b95a01c6a
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://ponafet.ru/award?keyword=central+australia+map+pdf PDF link annotation
    • http://suzamakulamuj.mypressonline.com/symmetric_matrix_eigenvalues.pdfIn PDF document text
    • http://save50it.info/viva_el_toro_english_translationhzu9j.pdfIn PDF document text
    • http://kanshoper.site/76106228087l2v22.pdfIn PDF document text
    • http://reduslim-ufficiale.website/notepad_informix_4gl_syntaxnhy9q.pdfIn PDF document text
    • http://nubebukexowi.66ghz.com/cyborg_android_full_movie.pdfIn PDF document text
    • http://pegejoruvufiron.sportsontheweb.net/2006_honda_civic_ex_coupe_third_brake_light_replacement.pdfIn PDF document text
    • http://healingtunes.ru/22746884243esvv6.pdfIn PDF document text
    • http://wijasagasipode.getenjoyment.net/25571753796.pdfIn PDF document text
    • http://sigixexizo.sportsontheweb.net/bebuzoxum.pdfIn PDF document text
    • http://soferijivav.getenjoyment.net/gmat_mba.pdfIn PDF document text
    • https://cdn.sqhk.co/xudevekelefe/ifWgffE/altura_pocket_rocket_2_review.pdfIn PDF document text
    • http://paxezot.getenjoyment.net/kupekofopuralosugul.pdfIn PDF document text
    • http://confirmationhelpcenter.com/duziwonanudovc93iz.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/djfeEjh/how_to_gain_more_followers_on_tiktok_hack.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://leribilif.rf.gd/6388886215.pdfIn PDF document text
    • http://mafujegimeti.rf.gd/crystal_report_2013_free.pdfIn PDF document text
    • http://zonatitusajobo.onlinewebshop.net/what_is_the_perfect_air_fuel_ratio.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_off0000e407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE407 5092 bytes
SHA-256: 150c345f871b91c24c7cd02711c50f1b7b1d85fcb2d21d6c79268a4343df384f
font_01_sfnt_off0000f53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53A 10948 bytes
SHA-256: 05c937fdae674ba024d684321f14ee6ed7fba4bd02d8c671e8a2710908d98d5b