Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a131d0266ee8e6f…

MALICIOUS

PDF

75.0 KB Created: 2021-09-17 06:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2265923d6cbc3cf80c714e2d9d04836e SHA-1: 0c0c14cc260a4795ef2449430fbafaa2e73f63d5 SHA-256: 6a131d0266ee8e6f00b8efd02f30b63ecac37ccc3ba555b3bcc7a230ca209e59
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns suggest it's part of a broader phishing campaign, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://oniceh.ru/uplcv?utm_term=free+name+ringtone PDF link annotation
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/xibikelejinuli.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/75901304898.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/tapaxirovem.pdfIn PDF document text
    • http://bushurov.ru/images/files/74281853792.pdfIn PDF document text
    • https://businesslife.com/content/files/34675509369.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/sitojajuxif.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78489475560.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/nisunudizuda.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/kasavezijukuxokotifutena.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/zaxajekijazopotokimunekos.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/1472420905.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/zuvodemoni.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/bizazuza.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/gifakopepener.pdfIn PDF document text
    • http://ty-int.com/files/files/fusexalabiz.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/vozabozofizobepadapi.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344cef80c6f---jikadivipofezasogazed.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/nilabovanagudogivolufolab.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/7744645725.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/17532610386133487a17332.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/fabisuwozeparasete.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/4g2ecmeclr0hjb1ci8hvm1q9f5/21908593866.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/1784005603.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/67663360057.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/fasiladez.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_off0000bfa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA6 18580 bytes
SHA-256: 645c9c9a239baacbf8a66e1af640e8cb0d03006a321043ba38003c22eca73eba
font_01_sfnt_off0000eff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10807 10216 bytes
SHA-256: cc93acd9a1fc6ad443711392267d7dcd7b72876536a416d9ed2d7e34c9ca1aed