Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3d87ad6c4472548…

MALICIOUS

PDF

74.6 KB Created: 2021-02-28 14:17:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 06df278a38062cabd926088d54c5c37b SHA-1: ec4af1bfb1672af6aebbcad037b6ad5099c3177c SHA-256: c3d87ad6c44725482f93cbff6e3482aa2749042cdea938fb6a90dd7fda5237a2
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://zajinet.ru/award?keyword=walmart+near+me+hours+on+christmas PDF link annotation
    • http://creditactive.info/mugukagijopegubezeberih2fk8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500453/normal_5fdf2cee13d32.pdfIn PDF document text
    • https://diwowure.weebly.com/uploads/1/3/4/5/134592565/a052eb.pdfIn PDF document text
    • http://hurleyshamburgers.com/50516965520k993d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446497/normal_6014db489f7e0.pdfIn PDF document text
    • http://maslovauto.ru/nirabozagerefafipavotu3k5.pdfIn PDF document text
    • http://italy-small.space/470198496154f4jg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374021/normal_60004582bb625.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451737/normal_6000510145f71.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403673/normal_5fc8de6850b0c.pdfIn PDF document text
    • http://demask.space/auvio_bluetooth_speaker_troubleshootingqdw33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408873/normal_5fde699bd945b.pdfIn PDF document text
    • http://yogist.fun/benefit_gimme_brow_colour_guidetj1u1.pdfIn PDF document text
    • https://gimelasu.weebly.com/uploads/1/3/4/5/134513778/3b5517e.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/dowavelaxam/16254841427.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/microsoft_management_reporter.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/shadowverse_f2p_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/formal_commands_in_spanish_worksheet.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_off0000e891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE891 5052 bytes
SHA-256: e565feffc6a49320bedacc58dc89dbe337a1d7d3145284d6cafcf8c92a71849a
font_01_sfnt_off0000f99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99C 10412 bytes
SHA-256: f2fee0e49d10a59a569e73a08970a5c333e947423b41f28b8160def45e33703b

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