Malicious PDF — malware analysis report

Static analysis result for SHA-256 96467d22a9abf1c2…

MALICIOUS

PDF

82.5 KB Created: 2021-04-23 08:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b63b830f4a365556052c2868b4b4364b SHA-1: 0987a51618e164c84ac0443ff2c878c5f28a2d8f SHA-256: 96467d22a9abf1c26e64cdaeb96566d6bbb473f889c5739df5af92634ecdf039
226 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or distribution point for malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The document's structure and heuristics point towards an attempt to disguise malicious activity as a legitimate resource, such as printer setup instructions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://kuzutuzo.ru/strik?utm_term=hp+6500a+wireless+setup PDF link annotation
    • http://buviturowugigew.66ghz.com/public_speaking_videos_for_high_school_students.pdfIn PDF document text
    • https://kitetunevoneg.weebly.com/uploads/1/3/4/7/134703129/ligevakomukenepor.pdfIn PDF document text
    • http://jotelefaxomawut.22web.org/beat_saber_oculus_quest_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384046/normal_600579a4de567.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452846/normal_5fcdf4e7650e9.pdfIn PDF document text
    • http://wawewifebobojum.22web.org/lewulovejumurigirika.pdfIn PDF document text
    • https://jolofoni.weebly.com/uploads/1/3/4/0/134042869/493476c2e9.pdfIn PDF document text
    • https://nifosigi.weebly.com/uploads/1/3/4/4/134488788/dosumonefesomepoxeg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494429/normal_5fec4e2798bc8.pdfIn PDF document text
    • http://selozufuwadapuw.66ghz.com/least_common_denominator_worksheet_with_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421630/normal_60395aea67e6f.pdfIn PDF document text
    • http://namixojebeku.iblogger.org/41273562735.pdfIn PDF document text
    • https://jadomuvifaxa.weebly.com/uploads/1/3/5/9/135960305/e1f8b7952ac41c.pdfIn PDF document text
    • http://dewizin.22web.org/32808947092.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pitodisile.epizy.com/gofumubor.pdfIn PDF document text
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_bc12c70cb47d467db3f29eaba19d73fe.pdf?index=trueIn PDF document text
    • https://d4e73f68-9870-4c81-be0c-0a6dd7607cd2.filesusr.com/ugd/6f53d7_6ae461d9f7864e75aa806dc825e37fde.pdf?index=trueIn PDF document text
    • https://a6f18165-9bfd-46c9-8f51-0ab50cd0b687.filesusr.com/ugd/265c7a_11fd9f91091f40788fe950c0f2283c43.pdf?index=trueIn PDF document text
    • http://buwumipulufi.epizy.com/sewigekidabosibefagekobo.pdfIn PDF document text
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_ba66897be6b0488ab74c85b630390063.pdf?index=trueIn PDF document text
    • https://460eb545-5389-4aa9-9e78-d1074a8bca0c.filesusr.com/ugd/21a131_7e41af8020214225a71a209aaccbcee8.pdf?index=trueIn PDF document text
    • http://molilaxe.epizy.com/bejeweled_2_deluxe_gratis.pdfIn PDF document text
    • http://marabawem.rf.gd/funny_brain_teasers_with_answers_for_adults.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_off000105ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FF 5284 bytes
SHA-256: 204129aa6058eb0178bddaa3f0202dcb7ec6a9630866f5a94257cfa29d01d766
font_01_sfnt_off00011814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11814 10796 bytes
SHA-256: fbc685679c23a6b4966ce16f419354827d4e5ae68f4f4e1246adadab42350707

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