Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8426aed7516daf9…

MALICIOUS

PDF

72.7 KB Created: 2021-02-05 21:19:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 4f37dfff796d995cba484998040762f7 SHA-1: fdcc8f7dee72e5c8af3fa003a79e68496ffb5101 SHA-256: e8426aed7516daf983746072dd76f241927503e6d9ab65a9bb7143a7ffda11ad
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://maypoin.ru/wb?keyword=collection%20house%20annual%20report%202018 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4420430/normal_5fcd259cdc439.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458631/normal_600409a495c47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413363/normal_5fd106e42f620.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465539/normal_5fee8a233cb47.pdfIn PDF document text
    • https://cdn.sqhk.co/xugufufifo/U7gfgc1/flight_edinburgh_airport_arrivals.pdfIn PDF document text
    • https://kelutatu.weebly.com/uploads/1/3/4/5/134521402/78c3173be.pdfIn PDF document text
    • https://cdn.sqhk.co/guwewaxa/jbmgcje/16694372766.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458125/normal_5ff45937ab5d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370777/normal_5ffd6b2161041.pdfIn PDF document text
    • https://cdn.sqhk.co/xaranoraf/ifSdhxD/vajegonigurinov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501777/normal_600f58b4a69dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417423/normal_600de13bc1992.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427105/normal_5fe6db2e78dbd.pdfIn PDF document text
    • https://cdn.sqhk.co/bumadawab/I5iaNgh/vampire_academy_netflix_trailer.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/remufuzu/rrbald._gov._in_admit_card_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/julesegil.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/differences_between_necrosis_and_apoptosis.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/cardiologia_pediatrica_libro.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_off0000dd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD60 5448 bytes
SHA-256: 64cb6feb5800b28559b309d0ac53b13199bbcb755364a2c4bd9a8a019ce6a853
font_01_sfnt_off0000efda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDA 11152 bytes
SHA-256: 2115ff300a49b2b9c469a4abeb6d623646b3acf7e080eccd8f730d728d0bc912

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