Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e81fd0a18885029…

MALICIOUS

PDF

79.1 KB Created: 2021-10-26 20:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8dde86b0770aeb580f3e025c1df83a60 SHA-1: 7e6ec6e2fe3da1bd1000c599d52ab0d0e25d8a34 SHA-256: 7e81fd0a18885029cde2a3c927affbd7f991d8814069e02f5923177c18612479
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier strongly indicated maliciousness. The embedded JavaScript likely redirects to a link farm, as suggested by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous external URLs, which is a common tactic for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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://opescom-store.com/uploads/FCK_files/file/buzedotijuneb.pdf In PDF document text
    • http://schokozentrale.de/idata/fixetobixosutebamulap.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/36878460615.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/5877757189.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/mobabigiwejakadisofe.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/xavez.pdfIn PDF document text
    • https://mkontakt.com/dat/file/76855396946.pdfIn PDF document text
    • http://sowaprojekt.pl/files/file/finaloz.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/fifeginonoxuremesujanafeg.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/16343268942.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/bazomuf.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/muforiwemimex.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/8459626734.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/wizupetuvudum.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202110/file/75496869953.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/tofarotelakegepoduka.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/xaxexajifipodafixotirado.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/rovobom.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/20490417841.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/jubajivo.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/juzomefasewu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613182d9e52a3---xojutirelazizumam.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/59898730444.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/RC0zOYPQW8A/uplcv?utm_term=5+vertices+and+3+sidesPDF 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_off0000d41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41E 10472 bytes
SHA-256: 97bb37b713db3a5e2e3b48528d2115c639d9c566294b01bb1b3cc25eb7548093
font_01_sfnt_off0000ec17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10429 16496 bytes
SHA-256: 7ab6258d0df2a6e67f2026a540da64ac09ac9ddfb5377ae4c8ac8779a7b5c318

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