Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b428c82f1de5f3…

MALICIOUS

PDF

73.2 KB Created: 2021-02-15 00:20:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 8e03c4699ac5bc9951f637d7561a3f6b SHA-1: 755219670971f39b7d6f463f856a773d3e76fadc SHA-256: 21b428c82f1de5f301598831283bed7db29521c3f7d50d9b956d3604218e9165
136 Risk Score

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
  • 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://baarspo.ru/wix?keyword=identifying+body+regions+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/nepofigiper/Ghjhahf/37939612156.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455684/normal_6027743b62d2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387242/normal_60295f814eb21.pdfIn PDF document text
    • http://55571.ru/25173103876mhoq3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367617/normal_5fcb23153d92d.pdfIn PDF document text
    • https://dejurepezuneron.weebly.com/uploads/1/3/1/4/131452785/vuvuwidamonusaviji.pdfIn PDF document text
    • http://hamsterbig.com/idsa_guidelines_meningitis_2017a7w5o.pdfIn PDF document text
    • https://labajamipudoxa.weebly.com/uploads/1/3/5/3/135399896/2f3b6182.pdfIn PDF document text
    • https://baginemesurewis.weebly.com/uploads/1/3/1/3/131380932/8175927.pdfIn PDF document text
    • http://lukanovetefitef.22web.org/jifutakusonuru.pdfIn PDF document text
    • http://mattelipsticks.site/9608979983813229.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/wisuw/japan_guide_tokyo_day_trips.pdfIn PDF document text
    • http://posojorodinu.epizy.com/guia_de_manejo_cetoacidosis_diabetica.pdfIn PDF document text
    • http://wifepex.rf.gd/mepifegejakabakinejewo.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/9116880345.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/formoterol_6_mcg_budesonide_200_mcg.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/charindex_vs_patindex_performance.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AD 5472 bytes
SHA-256: 0b6c29316f2c13ac49d6b461481d38035446b2aa33286f2a57b69187e5f31941
font_01_sfnt_off0000e65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65D 3128 bytes
SHA-256: 7a84c6cf4f46d4bac8fb6ba896b1cdf686c60a6b9912cc82b79a416172af7d16
font_02_sfnt_off0000f31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31E 10644 bytes
SHA-256: 821fe3275cb22c458ee41f5397bc91a865ad560d9a31a116c8807eee502a63ab

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