Malicious PDF — malware analysis report

Static analysis result for SHA-256 184789a4c39191d7…

MALICIOUS

PDF

78.2 KB Created: 2021-11-05 02:24:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0778dc013a9bcb26498e61607cde8466 SHA-1: 59e8e203546b7dd59ec955d40d3d23a4a3ac65b3 SHA-256: 184789a4c39191d72a2a4c6c0c073b2fe5d56d1cb00b6809afe5d5725fe80e06
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm, a common tactic for phishing or distributing further malware. The PDF structure and embedded content suggest it is intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • 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.
  • 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 http://emekyesiltepe.net/images_upload/files/27277104488.pdf In PDF document text
    • https://pulsekb.ru/admin/ckfinder/userfiles/files/xetow.pdfIn PDF document text
    • http://royalgroup.at/tmp/wixefufejoletejupumar.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/48142723023.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/49328393189.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161599ca12e3de---xafesiker.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/60841994314.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/22794898017.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/56966731798.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/zudijidabejogepe.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/90306722354.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/61830897933.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/vemetuzi.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/vujisaloti.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/5908858883.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/37487584276.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/mdq0v6ief4ps5ss4sr850aq96a/63773586822.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/4896014980.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021091523714_259125770.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/4625828286.pdfIn PDF document text
    • http://dostavka.markasib.ru/ckfinder/userfiles/files/25883488035.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/kemil.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/81545563915.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/71558099398.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/telusowakivezumepaniz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/1hHberoKktI/uplcv?utm_term=manual+citizen+wr100PDF 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_off0000cffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFE 17124 bytes
SHA-256: 1562d73bd575ae32dcb178d858c999a99088ea8264e69aaf2fb04de2b2c7e719
font_01_sfnt_off0000fbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEF 10348 bytes
SHA-256: 078cac49829fffc35123ad2c8d57cdc31b7787ce86127d09d2d6221ccfd2280a
font_02_sfnt_off00011392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11392 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1