Malicious PDF — malware analysis report

Static analysis result for SHA-256 c969a23ff7a0391a…

MALICIOUS

PDF

82.4 KB Created: 2021-10-04 18:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6b5c3cc6f7cd247cce6a82361923cd37 SHA-1: 2f5bdb1f071af720532b6ed06105cce143bca557 SHA-256: c969a23ff7a0391af407bb333c112f9371f12511f6f74d1ed3f18876cd2d8a92
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution by luring users to download further content. The presence of embedded JavaScript suggests it is used to facilitate the malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=skyrim+special+edition+download+torrent PDF link annotation
    • https://sanghvicranes.com/staging/media/venugisowimojalemava.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/mawixexuzapob.pdfIn PDF document text
    • https://collinite.pl/userfiles/file/44183853253.pdfIn PDF document text
    • http://opsir.eu/files/file/80194890924.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/xejodusatisinawebox.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/18914947868.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/76925479953.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/89915864140.pdfIn PDF document text
    • https://parkerboat.hu/js/ckfinder/userfiles/files/balusamokefiwinubavobuza.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/bopobelupanezitomumalixe.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/29317445085.pdfIn PDF document text
    • http://fourfoods.com/images/files/467275845.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/niborimogabepivezasix.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/3741193483.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/totozulowijebopojevado.pdfIn PDF document text
    • http://ginkgokatsudb.com/uploads/files/kajodakatidefiresagogi.pdfIn PDF document text
    • http://schokofontaene.de/idata/4703775707.pdfIn PDF document text
    • http://anm-av.de/uploads/files/98664737172.pdfIn PDF document text
    • http://machulski.com/public/file/botosazokidaguje.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/f2l3scobuo0b38qvpocnmb80a6/58384121128.pdfIn PDF document text
    • https://dom-titan.rs/files/jugup.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/xeriwoxedowekusad.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/a0d9effc5734e3e5fc35b5f45888d1e2/guxakupavesakegewulated.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210926/16326293997679.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_off0000d932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD932 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF144 18940 bytes
SHA-256: 25cd0a28ad982736215012a411af7a70cb5d67cee1b16f00724e28a229cb0a75
font_02_sfnt_off00012203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12203 11040 bytes
SHA-256: 2d49303c034002354d5edff36243ba4baaa3b27871d6478971ec1fa29d71578b