Malicious PDF — malware analysis report

Static analysis result for SHA-256 86700b7e8ea952a4…

MALICIOUS

PDF

91.5 KB Created: 2021-09-14 09:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f57886b855b6489463f0974e20446d2c SHA-1: 33a54fecd7e8255eebd7c2fc81719518d4ffde1f SHA-256: 86700b7e8ea952a48f11c8a7036410580e858f3b9558e4abf5c6324f07882856
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with high confidence. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The PDF also functions as a link farm, hosting numerous URLs that point to other PDF files, suggesting a multi-stage attack or a method to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://wastran.ru/uplcv?utm_term=agatha+christie+novels+in+malayalam+pdf PDF link annotation
    • http://gsemilia.it/userfiles/files/kibor.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/jidizevevagaxuforag.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210910_AF4119330A209A0B.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/sefogejufituz.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/32972027345.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/mogelutiwuwulesugunawo.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/monumefakosinafasewe.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/28014887264.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/48152735989.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/92597207707.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/1385937958614030957699e.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210914_141558.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/jalixigevutafugovidugu.pdfIn PDF document text
    • http://air-ned.com/uploads/files/11735308171.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/nuwugamuvizagazexab.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138ed90607f9---rozozizupapokagedoneki.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109020824465210.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/55909028136.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/faloji.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/potadotukinabozenufitose.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/viganejeva.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_off0000f876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF876 11228 bytes
SHA-256: 3ade7b83e96e43248dea08ea9ef4d5beb208277cf7d1b3b065256d8ce2e460b7
font_01_sfnt_off00011277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11277 20680 bytes
SHA-256: dca6c2da4d01201463b4b89151b9ac600b92ad57155b0da70832933c8f6158c0
font_02_sfnt_off000148ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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