Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d4438f090fbefe1…

MALICIOUS

PDF

74.3 KB Created: 2021-09-13 15:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1f010b4e01fad89c599cfdc8fa71e5e2 SHA-1: 8ba40f9e092e2956413ca0ae3034ecfb5d284413 SHA-256: 0d4438f090fbefe14b4284ac39726942b94717d40f0e4051a6c85e677ef7dc7c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple external links, with a high-confidence heuristic identifying it as a link farm 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 URLs suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://rotang.net/userfiles/file/59427986468.pdf In PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/d37cceb501a5806748a8d3b04c9ff2e0/wovum.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/22893316855.pdfIn PDF document text
    • http://intertravel.hu/_user/file/81506881231.pdfIn PDF document text
    • http://etre-belle.su/images/file/27520243763.pdfIn PDF document text
    • https://tomas-music.com/contents/files/65973444975.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/10804148445.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/91762276263.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/70991653201.pdfIn PDF document text
    • http://jarosi.hu/files/file/zagobilu.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/6780306699.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/segufamaravonate.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/43077824858.pdfIn PDF document text
    • http://firegallery.ru/img/upload/fisexexavipapajebu.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131219f5464b---bajugezivukojefobisuw.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/10263150152.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/seruzulubimepo.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/wikutawesasawe.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/58105142370.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/gogosajebirotupuxugeno.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/1360064217613d6a0f6ab99.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/fowafinidunojagezovep.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/sedaninekupabulim.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/34161873723.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/sizogagevuvuti.pdfIn PDF document text
    • https://luminex.pl/upload/file/87798597233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=comer+abnormal+psychology+pdfPDF 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_off0000bc04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD416 18088 bytes
SHA-256: 015c6f2251852aea41ef9dd01f08802c7c550477a8443502e3873b2800c52a83
font_02_sfnt_off00010246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10246 11160 bytes
SHA-256: 05b80cecc554ad4afbde3f41130b042720e2d09eac9debaf5fc5940f1efbcefd