Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab0d3a3c3d6d0ca…

MALICIOUS

PDF

76.8 KB Created: 2021-04-09 07:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d35a6a59a1b76304f4611f312d05e213 SHA-1: 123999a196f7535521870e3012050b3a1e97a4b3 SHA-256: 4ab0d3a3c3d6d0cac481c27e544d45684f9169a46afd5f37efc5493fcaa33c65
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many of which point to benign-looking documents, but one primary URL, 'https://vilenefex.ru/strik?utm_term=projekt+1065+chapter+summaries', is flagged as suspicious. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a tactic to obscure malicious intent or engage in link farming. The ML classifier and ClamAV detection strongly indicate malicious content, likely a phishing or malware distribution lure.

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 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.
  • 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/strik?utm_term=projekt+1065+chapter+summaries PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392218/normal_5fe82c4599cc4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401692/normal_5ff7856aa393f.pdfIn PDF document text
    • https://pekumovulimezel.weebly.com/uploads/1/3/4/3/134363026/c7c9a2e65c5108.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467561/normal_600f4cda09ada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477921/normal_600dde2ee3696.pdfIn PDF document text
    • https://dopovubejaxow.weebly.com/uploads/1/3/4/0/134017692/254740.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kaxukok/operations_management_12th_edition_stevenson_solution_manual.pdfIn PDF document text
    • https://05491ccc-77c7-428b-9c25-74f2c6c50d4a.filesusr.com/ugd/d51d36_bab663b118a946888a0dba366669127e.pdf?index=trueIn PDF document text
    • http://jenikov.epizy.com/19148731538.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/welirawemik.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/eczema_treatment_guidelines.pdfIn PDF document text
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_c010199d150640619b0f268970b53268.pdf?index=trueIn PDF document text
    • http://gukupexokopiwug.epizy.com/informant_5_help.pdfIn PDF document text
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_20ab640547994475a1bcbe6bec76c233.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/2_nephi_33.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/guide_convertisseur_de_devises_yahoo_finance.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_off0000ea91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA91 5752 bytes
SHA-256: c46701d11b0672dd89b8e5b5bce2a015e95fe5ccd93431b69712f8aaafe8f571
font_01_sfnt_off0000fe14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE14 11564 bytes
SHA-256: 1f58171d1923c8a0293122fc8df7ff28e966ed48717a43ec2cad15cc6672f8dc

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