Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdc94473fc38be56…

MALICIOUS

PDF

71.9 KB Created: 2021-09-22 09:38:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7d0d99de3aaefeb993556b27474fb430 SHA-1: adcc3bb17cfee1c59cef789a6c09fe2e4a202c0d SHA-256: bdc94473fc38be56735ad4abbf53daafd787be9dc366fc7afde9ee0a9320afb2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous links to external PDFs hosted on disposable domains, indicating a link farm designed to obscure the true malicious destination. The presence of external URIs and the overall structure suggest an attempt to trick users into downloading further malicious content, likely through a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://mtt-association.fr/upload/file/vefenimifonuruzav.pdf In PDF document text
    • https://aucordechasse.fr/vosImages/2596460479.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/mitomod.pdfIn PDF document text
    • https://comfort8889.com/upload/files/47056604807.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/17980330382.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/71285937119.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210912181533.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/99437578433.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/67345217032.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/43019372096.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/vorigilenesagozeregesevax.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/54492599744.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/42116448580.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/gutowowaxepikajonigez.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/bosigutesoropufinuji.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/fasakotuxofogage.pdfIn PDF document text
    • http://eternoohydro.com/d/files/67715147602.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/49911727592.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/87363818912.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141bd243cd07---ranofi.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/dumez.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/53820231783.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/gutuneloxido.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/mupuxut.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/zasokeju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=download+ultimate+car+driving+classics+mod+apkPDF 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_off0000b7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC7 15704 bytes
SHA-256: 7f96a6f19974ba03640af3e1f3891e9200104569d49686b0b1a24a2b5164677f
font_02_sfnt_off0000f7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B7 11200 bytes
SHA-256: bebfde71039e00fef476dd186a3e3369b1afa7ba044895658c06adea9a12b399

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