Malicious PDF — malware analysis report

Static analysis result for SHA-256 d64b76d26eee76fe…

MALICIOUS

PDF

91.3 KB Created: 2021-09-17 16:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 631a22ae468570987f6bd651ff107a95 SHA-1: 243bb0314b85ca06ab01b856671a356769b3fc77 SHA-256: d64b76d26eee76feddce28a008a7b2396bc818b91d7344009997304f267c2b33
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. It also features numerous external URIs, many of which are hosted on disposable domains, suggesting a link farm or phishing infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://hourinkan.net/js/upload/files/jifexexepoduziduga.pdf In PDF document text
    • http://ck-tct.ru/userfiles/file/57972454811.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/71211107270.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/ritupeto.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/83290630805.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/jetiguxiritasudome.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/sugubakesi.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/57003993067.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/81483799673.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ac4f54270---jetudizazin.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/86897726982.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130e650da0f5---69753798254.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/garisigaroju.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/23471766066.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/varibez.pdfIn PDF document text
    • http://ciskmv.com/css/file/dawulupexezusagelamusav.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/zofinagisutekesus.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/30775296326.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/60202816844.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/49269581756.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/zigede.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=one+more+chance+full+movie+freePDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BE 18040 bytes
SHA-256: 0099f703ef6e124b0a1d92f60137c8e53589205b6a50b99205a01f18aacdb6a8
font_01_sfnt_off00012fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD2 10528 bytes
SHA-256: 609cfb43b0aca6a21c605dd683e85e1b6d83ffe3be0d1f711554562698db41b2
font_02_sfnt_off0001478c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1478C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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