Malicious PDF — malware analysis report

Static analysis result for SHA-256 64b4e0701bc07993…

MALICIOUS

PDF

115.8 KB Created: 2021-04-05 18:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2198c51adb008520f108936037d5e1a1 SHA-1: ae3b751a65ad0ba8165798e76c36e3354b2b2d1d SHA-256: 64b4e0701bc079931d3d5b884b73de4b118b6bbf80b593d4606e04d7ab08e73e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a significant number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary malicious URL identified is vilenefex.ru, which is likely used to distribute further malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=lohse+divinity+2+build
    • https://static.s123-cdn-static.com/uploads/4377925/normal_5fdcd0f4945c3.pdf
    • https://cdn-cms.f-static.net/uploads/4403533/normal_603bf7b3297b7.pdf
    • https://cdn.sqhk.co/pigajifaw/MnPjabV/97262764265.pdf
    • https://cdn.sqhk.co/gimexigerub/yhfRgcE/high_school_diploma_templates_free.pdf
    • http://specialsale.info/akamai_netsession_interface_mac2xoqg.pdf
    • https://cdn.sqhk.co/buganisazobu/ibznKib/mimpi_ular_hitam_dalam_rumah.pdf
    • https://cdn-cms.f-static.net/uploads/4464080/normal_602febfa7499a.pdf
    • https://static.s123-cdn-static.com/uploads/4426558/normal_5fef42e54b4bb.pdf
    • https://cdn.sqhk.co/kavejufa/miahd6M/31295046289.pdf
    • http://jipolavex.medianewsonline.com/gonamafekuvusimapuma.pdf
    • https://cdn-cms.f-static.net/uploads/4449603/normal_600f7d7cb96f2.pdf
    • http://reestr.site/63041746045y0bxc.pdf
    • https://cdn.sqhk.co/fimegasaz/Vhx26hg/45494921652.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_fcbc594c9f124c0ca337992294e2ade9.pdf?index=true
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_da7d20b73acd4ea2bd464232e697270a.pdf?index=true
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_e7eb5d43d81846b2a742ae0d60a28e3d.pdf?index=true
    • http://gafijid.atwebpages.com/how_to_markup_with_apple_pencil.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017e06.bin
9c2ddcd5f941c2a06d46a636872f761dab99156f68110eadd324058ac7776e7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17E06 4864 bytes
font_01_sfnt_off00018e9a.bin
9ce4477e4b0cd3645ddc8d1d6b42e75e0d037c94b5a9667bcf9fc149678e3518		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18E9A 11032 bytes
font_02_sfnt_off0001b42e.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B42E 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.