Malicious PDF — malware analysis report

Static analysis result for SHA-256 13ddc0de4de02131…

MALICIOUS

PDF

89.1 KB Created: 2021-09-19 08:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 606b8002355fc9df45a12aa926e677fa SHA-1: a29d0f0e26b8c35b94685c0c10a6c116944e7516 SHA-256: 13ddc0de4de021316a6d3c87f99d0e0a373ec0b86bda5c9479d8e6a1501a4714
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these redirects. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • 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.
  • 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://educationindiajournal.org/ckfinder/userfiles/files/30576031350.pdf In PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/71009287382.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/df2fcbecc291a34bd3a2e32a68093134/4516424382.pdfIn PDF document text
    • https://dhesient.com/media/jijuniwe.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/xomilifafazudegavo.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/motas.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/23382099924.pdfIn PDF document text
    • http://secoinblock.com/upload/files/58460686715.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/8302277201.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/sevojetoj.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219388262458.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/zerusuvupurakusisamew.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/36349010848.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/jof9grhnt826t64cnl51540250/11871696643.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/51666489947.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/vusevumoxalozoxarojoz.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/definirupawakil.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/27883494747.pdfIn PDF document text
    • http://mc-opony.pl/files/file/19632359794.pdfIn PDF document text
    • http://happy-land.hu/editor_up/31805159297.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/35722769459.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/kepisamubujubi.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/14973781598.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/gopibebalesarosafin.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/naguboj.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/30576273858.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=the+strong+ones+watch+onlinePDF 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_off0000f606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF606 18716 bytes
SHA-256: 5a74c8bae637e6892b31c732f812ee2f0329931daff680e1650900b8d97aeeef
font_01_sfnt_off00012648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12648 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E5F 10560 bytes
SHA-256: bcd38996f8ac2a98aa91e37b9ded49826c4367b0203c93fcf5b297580a8450cb