Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbcc52529b47df47…

MALICIOUS

PDF

80.2 KB Created: 2021-09-19 09:36:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5f7dbf5b62a87a910179fe06dab83f28 SHA-1: 6b9bcffaf328ae5b3ed88062351494db5cfa9ee2 SHA-256: dbcc52529b47df47d37a8ecc6cf14ef9eb4f24c27b1bd0af8b74bb968a1c62f2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded content indicate an attempt to disguise malicious links, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=dragon+ball+z+tenkaichi+tag+team+2+apk+download PDF link annotation
    • https://schmitz.cz/res/file/dofowuvule.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/50224587507.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/53400928377.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/18421907158.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/wirobiloz.pdfIn PDF document text
    • https://cartolmania.it/file/fojak.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/95398206335.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/melimutokek.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/68723836015.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/tezefuzidorejele.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/sunovopuwaxoxinaxejesun.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/74466465671.pdfIn PDF document text
    • http://klenderbio.com/upload/files/87310318925.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/14c69c0b50adc4e34b4d095f33646005/xusekiwelatopenopupabino.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/99720155214.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/72304087605.pdfIn PDF document text
    • https://ratodua.com/contents/files/35266766514.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109060921132930.pdfIn PDF document text
    • https://designclarf.it/file/lexunu.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb2faee46a---6960016662.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/sawojakubogenujuw.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/ganomatitukimarajox.pdfIn PDF document text
    • http://yljczl.com/uploadfile/20210916215024517.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/92945309005.pdfIn PDF document text
    • https://www.posluh.hr/ckfinder/userfiles/files/14941052770.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_off0000d3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A8 11292 bytes
SHA-256: 5e6e680276c657bfba60ff17181eae9e24ed1940b657d246324b02e67bd78a43
font_01_sfnt_off0000eda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA7 17176 bytes
SHA-256: 97fe44f4f131c5bf5bbacbaa35d7ab2be9dac7afcbaf1e28b55db9af9f3d050e
font_02_sfnt_off00011a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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