Malicious PDF — malware analysis report

Static analysis result for SHA-256 b039106f67dbab51…

MALICIOUS

PDF

77.4 KB Created: 2021-09-28 18:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: c59334fbeedd6df441be527d3b06ae81 SHA-1: cde63109b1f894fed37ba1ab53d840a7db8edab5 SHA-256: b039106f67dbab5115653d42c9b33d4418fb143d37b51b1d028152b268a9c5f8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/uplcv?utm_term=extension+dark+theme PDF link annotation
    • http://vipdiler.ru/files/file/vubimezabokawuwavijovagek.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/jetixewelu.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/tajibujekexetowawivavuki.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615189ff117b9---nurafozawedetijevasena.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/revebalejegitulixim.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/pugevamurokebotemobazo.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/90621917338.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/98073968838.pdfIn PDF document text
    • http://kht.civilkozpont.hu/uploads/file/1097905337.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/tovizubojupinapa.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/15629239553.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/43345611758.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16150917c2be6b---wiwisafowexijewerero.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/82266698652.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/derepupubefadajejufamama.pdfIn PDF document text
    • http://tid.vn/upload/files/52261212039.pdfIn PDF document text
    • http://rts-3.ru/upload/files/kesudijotipe.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/famaw.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/ruviluzazesujubukalijofa.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/12750321412.pdfIn PDF document text
    • http://btfa.tw/upload/files/xevolapiwowusabirijegore.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/87287491173.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/64136036620.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/38098812211.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/nawifejal.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_off0000c61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61D 19020 bytes
SHA-256: bbc1233e65658e6041efb0c23792de3976e8056d8abd5765966a6b1d6dbb5586
font_01_sfnt_off0000f79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB5 10644 bytes
SHA-256: b73dc846bc37f80f28753b5c43e67fbd4bb2836f6f846243469cd21843e76291