Malicious PDF — malware analysis report

Static analysis result for SHA-256 fde6091e89c58540…

MALICIOUS

PDF

72.0 KB Created: 2021-10-02 09:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5d5e33745d926142b2a8facd7b72dd5c SHA-1: 0305f772f5f1f7b888945235c457976377a1a0ec SHA-256: fde6091e89c58540b03ba5c41c14018bcce4efa73501b61486b6791fdd239d9f
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript which is a common technique for malicious PDFs to execute code. This script likely redirects the user to one of the numerous external URLs found within the document, such as 'https://ketchas.ru/uplcv?utm_term=professional+disposables+international+inc', which is indicative of a phishing or malware distribution attempt. The high ML score and ClamAV detection further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://ketchas.ru/uplcv?utm_term=professional+disposables+international+inc PDF link annotation
    • http://fcvperu.org/data/fcvperu/userfiles/file/xabazopavanesida.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/19012835783.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/91020801792.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/31233867700.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/sidimelorojukexin.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/lumubexafamijepokomapu.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/53264905838.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/55315826910.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/kazelebi.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/jonerenototaxovowepam.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/vuvatozilij.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/34292783391.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/14615149126.pdfIn PDF document text
    • http://news-hk.net/uploadfile/file///lesadefefumuzimup.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/gejono.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/33550022280.pdfIn PDF document text
    • https://teamcode.net/upload/files/xodezune.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/luwoni.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/sesis.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/17502285827.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/55897274749.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/83606cc79f94b8047d9071f437afd4a1/nelolewemuvebumideme.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/32955206787.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/8707672644.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/kolufibakijonuxilawu.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_off0000b36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB82 10752 bytes
SHA-256: a0bbef8e497cc26e09cbc323df64dc7b19f65dc10cbacf06c5e957fc78a6223b
font_02_sfnt_off0000e41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41D 17976 bytes
SHA-256: fa76085ea52945b17085b2f4251b126cc16aa2a73183254de1befab0036b8f16