Malicious PDF — malware analysis report

Static analysis result for SHA-256 f691cb068e7d8267…

MALICIOUS

PDF

71.2 KB Created: 2021-09-30 12:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f297ba058940ba224f586c067cc4d33e SHA-1: f139dfc7cebfd802daad6d44bc71a9dbabb64487 SHA-256: f691cb068e7d8267e1bdc3bb38b347d05aaaab32700514dfda5bc5b3c560a1f4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://allytemp.ru/uplcv?utm_term=what+does+it+mean+when+my+phone+is+in+safe+mode PDF link annotation
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16136064f961d6---tiraritagunilokower.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/ferilalubexedolef.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/74518379598.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/1154218662.pdfIn PDF document text
    • http://marketingnews.fr/images/file/farotu.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/fagafuravoruj.pdfIn PDF document text
    • https://resicolor.com/upload/files/58390471574.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/milekat.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/padowosifosopesasadidete.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/8914689462.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/lamimiluwaro.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/94213896973.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/7910574245.pdfIn PDF document text
    • https://31app.com/userfiles/file/96380313420.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397f71b1aff---47500437777.pdfIn PDF document text
    • http://pololanna.com/user_img/files/junijomosotokebazekole.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-17-08-44-10-30.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/pemifalebifuxiro.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/24889277258.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/biwuliwadapatesifuxugowop.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/nipebokiv.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/posudisijikuvuzoso.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/88056513769.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://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_off0000b31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31F 10808 bytes
SHA-256: 64cf8ae7f2cecfabe5c07019fc9ea072cc01e93fa5415f8168a60bb43291b67e
font_01_sfnt_off0000cbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF3 17156 bytes
SHA-256: e32618bc2b783e9b302bbb17f5158a1da94bcf09f603a210ba846f8269f751fb
font_02_sfnt_off0000f6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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