Malicious PDF — malware analysis report

Static analysis result for SHA-256 6612cc244a4b6d91…

MALICIOUS

PDF

77.2 KB Created: 2021-03-15 11:57:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8c2af86913e0328915ed93c0e04bf06f SHA-1: 1081356939d93e470d8dcb7cea9cf0833cb77fce SHA-256: 6612cc244a4b6d917a08ae3b56c550882be7b951f23e2168f9de008d644952f2
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external links to other PDFs, with one prominent URL being https://vilenefex.ru/123?utm_term=make+a+sentence+with+guide+word. This suggests the document is designed to lead users to potentially harmful content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://vilenefex.ru/123?utm_term=make+a+sentence+with+guide+word PDF link annotation
    • http://usblighter24.site/jusogasigufe61qg.pdfIn PDF document text
    • http://sewonmedix.ru/what_are_the_tools_used_to_analyse_datajx2lp.pdfIn PDF document text
    • http://boketizabujig.scienceontheweb.net/how_many_carbs_in_matcha_tea_latte.pdfIn PDF document text
    • http://znakomstva69.space/digno_eres_de_gloria_letra_rey_de_reyeso6x0j.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://441dbedc-201a-49d7-bb2a-292980023e2b.filesusr.com/ugd/473728_2bda413e6fe94c7e847034d18f6239e0.pdf?index=trueIn PDF document text
    • http://porugunime.epizy.com/how_do_you_bake_fresh_pizza_dough.pdfIn PDF document text
    • https://0c6b7a74-1ca0-41da-943c-c268a208a416.filesusr.com/ugd/fef373_9abfa3568f32458ca2680ed9c328f26e.pdf?index=trueIn PDF document text
    • https://882e4f53-a7e1-4d4a-89e8-a6e6d9f9b805.filesusr.com/ugd/9a13d2_ea1bf8b39e304b61b3cdae56780c2a46.pdf?index=trueIn PDF document text
    • https://02664c88-84e5-42fa-aae3-682d3a0d4328.filesusr.com/ugd/39d081_bb4ead1204094e7f804c059179f83e0b.pdf?index=trueIn PDF document text
    • http://nuvodewaguz.rf.gd/86985889187.pdfIn PDF document text
    • http://vutimeban.rf.gd/gajiwivevifelo.pdfIn PDF document text
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_d1e97358a36c4e78a850fd5b0890bc18.pdf?index=trueIn PDF document text
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_015e396345b547daa05a4a3752eedb3e.pdf?index=trueIn PDF document text
    • http://bexukavibume.myartsonline.com/what_happens_to_a_car_when_the_catalytic_converter_is_removed.pdfIn PDF document text
    • https://989244f3-426d-4557-b4f1-0018dac9047c.filesusr.com/ugd/57c819_76941f49349349e59adff223cfd03578.pdf?index=trueIn PDF document text
    • http://dosazazavepa.rf.gd/bebodiremigutajebewur.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_off0000ef27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF27 5328 bytes
SHA-256: b32fb8a08eb9a666cb43f60681eef3a06e7d24e57238725ef2c37442e39d605b
font_01_sfnt_off00010161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10161 11368 bytes
SHA-256: f235fab02a06f79bb68bcacaedbf7cf7fe6e719f00cf171ebcf15a0f1dd218f5

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