Malicious PDF — malware analysis report

Static analysis result for SHA-256 adc3ac9ea07a32a8…

MALICIOUS

PDF

95.7 KB Created: 2021-03-27 21:42:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 740e1c05a67759829cda5b9abbf4c483 SHA-1: 996d682caa03857287f5fb2a572c1537c385e2af SHA-256: adc3ac9ea07a32a86d2accf0ed0cccef7fd2f9179209bfd6807b3c130a2f6567
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-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/award?keyword=alcanos+propiedades+quimicas+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369933/normal_60123392b3d64.pdfIn PDF document text
    • http://dkblogin-de.com/rigirosuravovavujilosini9o2kr.pdfIn PDF document text
    • http://myluckybet.xyz/who_is_dish_network_internet_providerzwi3d.pdfIn PDF document text
    • http://popularchoice.space/rope_knots_loop6719s.pdfIn PDF document text
    • http://chisto-chisto52.ru/belukikocpfno.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489977/normal_6009770ebf19e.pdfIn PDF document text
    • http://domainlimax.xyz/kisijadepomixaniforokepev8xek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417808/normal_600e21bfafc1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466666/normal_60358767b0658.pdfIn PDF document text
    • http://freud.icu/glass_animals_the_other_side_of_paradise_official_video59n0h.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426815/normal_5fd04b15b0f6b.pdfIn PDF document text
    • http://gbo.guru/tuxinupunonekupoguwokchbg.pdfIn PDF document text
    • http://ecoservice-vlad.ru/ralireruhobee.pdfIn PDF document text
    • http://smartcoin.design/english_comprehension_worksheets_for_3rd_class2tx89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497353/normal_601b51194a2bc.pdfIn PDF document text
    • http://electrumwallet.buzz/couple_avatar_make_your_own_couple_avatar_apk9pqkh.pdfIn PDF document text
    • http://dombitarf.ru/radimitepesoxizatuvegifbomkn.pdfIn PDF document text
    • http://tekplafond.xyz/76079990251m9zv0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/771a3e22-c544-4377-afce-68b7821e1b25/95921201970.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/144b4e5e-2912-43d8-9bbb-9c723a4ad9fd/relion_ultima_glucose_strips.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_off000134d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D2 5416 bytes
SHA-256: 0ba8eaadb5400bd1cae712303c36974cfb3dfc4c7c810ca7dd7b2f7b93ad5647
font_01_sfnt_off00014727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14727 12944 bytes
SHA-256: 11bc1099b2ebd7408342f3e7cbf2e88916763c30c8eb87c84bdecbae668fcfa5

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