Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f155000bef6c42f…

MALICIOUS

PDF

94.0 KB Created: 2021-02-27 21:33:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5010723d717d463391982b94281d036a SHA-1: 5ea117eb9e6a140517dbd93f65980a3fa79db463 SHA-256: 9f155000bef6c42fc90792726f3d6e98fc2be7e536713954344bf47aab12bc9e
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 0.9997

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://druttle.ru/123?utm_term=resumen+de+la+obra+el+principe+de+maquiavelo+pdf PDF link annotation
    • https://fiwinibikevuli.weebly.com/uploads/1/3/5/3/135339450/rodazomazifimo-zubirukub-xokebomipuva.pdfIn PDF document text
    • http://dujojiwasemob.mywebcommunity.org/tufapomogizu.pdfIn PDF document text
    • http://zizodoroluxonaf.sportsontheweb.net/83700290254.pdfIn PDF document text
    • http://dotixomovi.sportsontheweb.net/how_to_fix_error_code_51330_on_the_wii.pdfIn PDF document text
    • https://lugelobixo.weebly.com/uploads/1/3/6/0/136095506/bevudupujebewen.pdfIn PDF document text
    • http://poxumanavofeboz.scienceontheweb.net/can_i_connect_internet_through_mobile_hotspot_to_pc.pdfIn PDF document text
    • http://pedumerik.sportsontheweb.net/46353345357.pdfIn PDF document text
    • https://gebusoju.weebly.com/uploads/1/3/0/9/130969184/9094143.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duvodix.myartsonline.com/how_to_charge_timex_solar_watch.pdfIn PDF document text
    • http://luxotenudiwuzu.rf.gd/kinkos_business_card_template.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/samapuxixodebisugenajajib.pdfIn PDF document text
    • http://sazevaxorofezag.epizy.com/dibarewefiwilutijewo.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_off00012f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F95 5636 bytes
SHA-256: 936ebae81952cc111ad92ef3ebb381beb270b67a6f4dce542fff446d1099b426
font_01_sfnt_off000142a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A9 11724 bytes
SHA-256: 256f2c004990a5dbb997f0a6fd064580c0ddf6d347b18ac588a133cf72b489a6

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