Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7bed0584b6b9438…

MALICIOUS

PDF

75.7 KB Created: 2021-02-25 05:05:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ade4909d2873425b6a0c8dddc82e0c7 SHA-1: aeb5f8d06fdffc5244d702830fdf320c41dec3fd SHA-256: c7bed0584b6b9438e1b9b6fd2983d1e12683dff67013135ef47d6643e137bcae
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, indicating a link farm or phishing attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/123?utm_term=how+we+met+quotes
    • https://bizalaso.weebly.com/uploads/1/3/4/4/134443832/4139234.pdf
    • https://cdn-cms.f-static.net/uploads/4409110/normal_602aefed12044.pdf
    • https://zejuvuvegodefi.weebly.com/uploads/1/3/1/4/131453892/zemiratixubekal.pdf
    • https://jitegolugitu.weebly.com/uploads/1/3/4/6/134643776/c1a624.pdf
    • https://cdn.sqhk.co/bitaxukezor/ggdiaib/98163465688.pdf
    • https://dupukixulin.weebly.com/uploads/1/3/2/6/132681516/833140.pdf
    • https://bumeguzi.weebly.com/uploads/1/3/5/3/135391430/kabetaxaxarawak-wuvojirigaduni.pdf
    • https://nogexumojadug.weebly.com/uploads/1/3/4/2/134235638/13b5e622cd37.pdf
    • https://favexolifuluk.weebly.com/uploads/1/3/6/0/136092880/jegukubetafenise.pdf
    • https://cdn.sqhk.co/dakuwuwuzije/g0hfjhN/classic_cars_for_sale_in_mesa_arizona.pdf
    • https://mefufexuwi.weebly.com/uploads/1/3/4/0/134019004/a3eea050113ccd2.pdf
    • https://cdn.sqhk.co/fapetemiji/2H49gfG/59756175713.pdf
    • https://static.s123-cdn-static.com/uploads/4445882/normal_5fdea92681525.pdf
    • http://setovewurepenu.22web.org/employee_provident_fund_scheme_form_19.pdf
    • https://cdn.sqhk.co/vizelupavew/OhgMGhh/delicious_website_for_teachers.pdf
    • https://static.s123-cdn-static.com/uploads/4371523/normal_5fd06f45410ef.pdf
    • https://cdn.sqhk.co/dijabidasu/PFiaijb/mystic_vale_expansions_ranked.pdf
    • https://cdn.sqhk.co/mewivupa/Y5EhbtH/cowboy_bebop_shirt_etsy.pdf
    • https://serarabasujuz.weebly.com/uploads/1/3/1/6/131606617/2c589c2455e.pdf
    • https://cdn.sqhk.co/vipabumumiw/ziggiM0/23570656723.pdf
    • https://cdn-cms.f-static.net/uploads/4459787/normal_6029774dc0395.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xagewojijakeri.rf.gd/osrs_shamans_cannon_guide.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee96.bin
e6127216d719d2ad5feb20432105df6920b6775356bc94e6d456679095cd6525		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE96 4672 bytes
font_01_sfnt_off0000fe81.bin
be954e7e1dbdf3686639ec098917cf3af919e3b479f35783fe737f450fcb7bc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE81 10276 bytes

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