Malicious PDF — malware analysis report

Static analysis result for SHA-256 df0cd54a1f09074e…

MALICIOUS

PDF

75.9 KB Created: 2021-04-08 06:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 14bc03b3d0b7895aee8291f2e02aa669 SHA-1: 728954fc27564a83a07c2043d4e7512986af2d81 SHA-256: df0cd54a1f09074e2360e7bf60d44aa2be771c3d512d28ad1d7037b9971aca48
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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-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://pelibifir.ru/123?utm_term=dies+irae+music+sheet PDF link annotation
    • http://my-favshoph.online/do_electric_fences_work_on_huskiesmmhwx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416510/normal_6011ec408117a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367656/normal_5fd243e97d89d.pdfIn PDF document text
    • http://bluebadgeform.com/dirazonipanflxn.pdfIn PDF document text
    • http://kalidejomepajo.scienceontheweb.net/fovubobonowuxal.pdfIn PDF document text
    • http://peludofnor.fun/bobaxodovezeyeh1x.pdfIn PDF document text
    • http://paxezimusosesa.scienceontheweb.net/que_es_arquitectura_de_computadoras.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365546/normal_600da13e45623.pdfIn PDF document text
    • http://game-pro.xyz/27531649610c16ie.pdfIn PDF document text
    • http://trelon.fun/gomipaxizuxelavmhc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427514/normal_600a015bc7565.pdfIn PDF document text
    • http://xifogoweru.22web.org/31914641380.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://disoluje.myartsonline.com/4942114296.pdfIn PDF document text
    • http://batapijas.myartsonline.com/45316744415.pdfIn PDF document text
    • http://fizodebejena.rf.gd/gukuw.pdfIn PDF document text
    • http://wisopex.epizy.com/67318508007.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_off0000eb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB43 5008 bytes
SHA-256: 9b797812a23c5394c802751ee47f8c375278d49bfa835fe96a932db23300c920
font_01_sfnt_off0000fc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC22 11476 bytes
SHA-256: c0e36a619364e735daa71b63a122dee01e5d2fa7489c69f20ba33fa4382ce9bf

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