Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d43e36b7260a948…

MALICIOUS

PDF

68.6 KB Created: 2021-09-10 16:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f66f331f905c38c72f5a4896b6a07250 SHA-1: 2e5e8e05ce36ac8325b244c799a53264c61fc374 SHA-256: 9d43e36b7260a948dc10c81734235bf486e7100117b65b069a0cf21401b66507
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, commonly seen in phishing or malware distribution campaigns. No scripts were extracted, but the presence of external URIs and the overall structure strongly suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://fogathajtohirek.hu/fckfiles/file/xewoxagipoze.pdf In PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/pijuleme.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/22288283.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312f633086a---12212792265.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/60798964900.pdfIn PDF document text
    • http://chinalabware.ru/d/files/47945451127.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/memeworowafezunemiluz.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/radavilazunuzalejudufu.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/depewupotavulol.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/wazopozawobefesekimor.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/19043906542.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/58266657856.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/21757288457.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/sasudoregulefije.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/senijipezijuxakilus.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/zaxoxirugisonenagokolibi.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/60019967667.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/36481995822.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/10399130985.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/zutowepojunimatuzib.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/xuvimovoribogazeku.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/nanabovajumu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=photo+translator+premium+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_off0000ae99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AB 14724 bytes
SHA-256: eb822eb82f2a7d4f5fcf6f68ea4e96f949fa7af76c0ce3d223f86b1cc11c0bcb
font_02_sfnt_off0000ebaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAF 10852 bytes
SHA-256: f7eb29f53f98dda6ec93de02befea98766a8830e390fde3a92b72b241b3da14b

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