Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b306385a5b09fe…

MALICIOUS

PDF

74.7 KB Created: 2021-03-01 07:07:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: f43047ca60b8e3cbfd98e427c415e3fe SHA-1: c37d9e7fbd20591a9be3f05d79650c09fb264044 SHA-256: 40b306385a5b09fedbc17c6945c909481423567d31f2d3a475343dc3b28bba50
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://kuzutuzo.ru/aws?utm_term=grade+3+spell+bee+words PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4424981/normal_5fc7af44776a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373797/normal_5ff319b0a9894.pdfIn PDF document text
    • https://neseveroxikiz.weebly.com/uploads/1/3/4/6/134603771/pigixesaludumumatate.pdfIn PDF document text
    • http://fexevewuli.mypressonline.com/kindle_paperwhite_battery_replacement_service.pdfIn PDF document text
    • https://cdn.sqhk.co/xibetevoxaj/rhdWjam/tezinupubozimameb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480148/normal_5ff9196bc3d59.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446016/normal_5ff9847ddd11b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411923/normal_5fe657fe2ecdb.pdfIn PDF document text
    • https://ravemazezaj.weebly.com/uploads/1/3/4/8/134885195/3851763.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372382/normal_600f201591ee9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495681/normal_5fe265917dc85.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/bgigyrc/hot_wheels_ultimate_garage_shark_replacement_parts.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373304/normal_5fda46eb3a386.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://namakanexir.atwebpages.com/lozapokonizisomofeb.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/94389202526.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_off0000e706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE706 5380 bytes
SHA-256: 6d0f38a1d8568bd3d8b3e495aece9870ae5abcf2f352f49e2fd4c711b3cdfc3a
font_01_sfnt_off0000f96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96C 10744 bytes
SHA-256: 05e6f50e49421a86f8b892158eb022a0aa10d500a2ddbf950957691d4d0d9b70

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