Malicious PDF — malware analysis report

Static analysis result for SHA-256 810a6b1819bd7cac…

MALICIOUS

PDF

80.1 KB Created: 2021-03-20 21:00:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 7da125f0fd38f95034e10f86b78c2b19 SHA-1: 471b4257eaecee3de95545d9c19f92fd89a62ed5 SHA-256: 810a6b1819bd7cace6d7d71044ed7370029a775c3e27c20688800876cb37618c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URLs, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the presence of URLs.

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://golowaki.ru/123?utm_term=bundletransformer+less+example PDF link annotation
    • http://vumogegotawugub.mypressonline.com/32361411203.pdfIn PDF document text
    • http://musomojil.mywebcommunity.org/55096287209.pdfIn PDF document text
    • http://mojofaza.mypressonline.com/bendable_concrete_free_download.pdfIn PDF document text
    • http://wetiludivarag.scienceontheweb.net/what_does_a_blinking_red_light_mean_on_a_samsung_tv_remote.pdfIn PDF document text
    • http://larebalin.mypressonline.com/foleluzelekukuta.pdfIn PDF document text
    • http://somubuzesixuwun.getenjoyment.net/quant_job_interview_questions_and_answers_free_download.pdfIn PDF document text
    • http://lozejebivo.scienceontheweb.net/bowflex_pr1000_home_gym_accessories.pdfIn PDF document text
    • http://paxezot.getenjoyment.net/how_long_is_the_invisible_man_book.pdfIn PDF document text
    • http://sopesukenapad.scienceontheweb.net/fuxuj.pdfIn PDF document text
    • http://jugepawe.medianewsonline.com/sozij.pdfIn PDF document text
    • http://lunatan.medianewsonline.com/myers_and_dewall_psychology_12th_edition_citation.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4bc473c2-84d0-4913-8b4e-281bf44fba2e.filesusr.com/ugd/a25dbd_ff95f8537d7843568e591b5a0519ab6f.pdf?index=trueIn PDF document text
    • https://fe426b01-1dd0-498a-b08e-7ec37e320b94.filesusr.com/ugd/6b45f0_aaf3a0cb419847f7af528079d8e7bf2f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/97015856774.pdfIn PDF document text
    • http://ruruwuvatokatal.onlinewebshop.net/86077634637.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/sample_aac_audio_file.pdfIn PDF document text
    • https://s3.amazonaws.com/gagotaniwipure/castlevania_aria_of_sorrow_rom_espaol_android.pdfIn PDF document text
    • http://xekazaz.myartsonline.com/22549708316.pdfIn PDF document text
    • http://dakafatuvuguviz.atwebpages.com/bipilekad.pdfIn PDF document text
    • https://f8d4b294-f952-4a11-85e8-0a3036f9bdaf.filesusr.com/ugd/ad8f3a_6b9261407ab54ec196eb16498d8ea5e1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/64766911157.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_off0000f6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DE 5304 bytes
SHA-256: 13d423c3b3bf9ca692871c103aff0e16d1138cea53452c6cf9483a83366ec129
font_01_sfnt_off000108d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D6 11872 bytes
SHA-256: 3f02646d018c417c65c00142045b35cc84fca0fc6aff76115857faaf255f9536

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