Malicious PDF — malware analysis report

Static analysis result for SHA-256 51cb5c89832c098f…

MALICIOUS

PDF

79.6 KB Created: 2021-04-01 20:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 06f6a466b1d27d6fcf757e8c63ac6da2 SHA-1: 0b875d027f08d9e44cdd36799d893a423808f8b4 SHA-256: 51cb5c89832c098fd7d4b35f5c89af6cbd067126cf48798a1dd46918e437bc7d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to domains associated with SEO link farms, suggesting a malicious intent to drive traffic or distribute further payloads. The ClamAV detection and ML classifier strongly indicate malicious content, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used for phishing and potentially malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/wix?keyword=milex+pressure+cooker+xl+manual PDF link annotation
    • http://xilexevu.scienceontheweb.net/lekel.pdfIn PDF document text
    • http://ligumexijigab.getenjoyment.net/how_does_apple_airport_time_capsule_work.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477626/normal_5ff5eb0736de5.pdfIn PDF document text
    • https://xumipapabof.weebly.com/uploads/1/3/4/6/134609146/837b44773c4aa73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410415/normal_5fd087a2c5132.pdfIn PDF document text
    • http://gatorama.space/415108018040y9t8.pdfIn PDF document text
    • https://sudororurupe.weebly.com/uploads/1/3/4/6/134602833/de4556492bd8.pdfIn PDF document text
    • http://nonretloli.site/pumetodepaxoletwywnp.pdfIn PDF document text
    • http://future-techno.ru/706561136174ketp.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/kulinisokakewi/timokelaxagivo.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/55252319730.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/72770689169.pdfIn PDF document text
    • http://vewawisu.onlinewebshop.net/82223272914.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/42894759808.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/solidworks_sheet_metal_drawing_show_bend_lines.pdfIn PDF document text
    • http://kifesafijupesob.onlinewebshop.net/zomaf.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/nobodewekezeritubupu.pdfIn PDF document text
    • https://s3.amazonaws.com/veledabejufi/6.0_powerstroke_service_light.pdfIn PDF document text
    • http://ginowane.onlinewebshop.net/simple_present_past_future_tense_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/87061239667.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/how_to_write_a_short_bio_for_a_new_job.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_off0000fa34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA34 5216 bytes
SHA-256: fe6354f7c52d2e8ca18bfb430b650054c884a06a9aceeee5e2a43506c1d78378
font_01_sfnt_off00010beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEB 11020 bytes
SHA-256: 781b4a61c3461573a66c281924e87383bc642ae503b02e052e0a28ceb21bc93c

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