Malicious PDF — malware analysis report

Static analysis result for SHA-256 293cc9923d159e0f…

MALICIOUS

PDF

79.1 KB Created: 2021-09-12 09:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 124a1b8c712f4896909ef2057ef02ebb SHA-1: c56c785545fcf84f76efeb9caf5029a52fff47e1 SHA-256: 293cc9923d159e0f050a2d9d2de5f5ae1d85ad1d9a47876dd401c01063c479b6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains, suggesting it functions as a link farm or a lure for phishing or malware downloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the nature of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16132fe3180f79---46578754961.pdf
    • https://novamakine.com/upload/ckfinder/files/67149888981.pdf
    • http://pnalog.ru/images/file/lelomuzepesotubuwiwiko.pdf
    • http://letresorellebio.it/userfiles/files/15406906395.pdf
    • https://datxeninhbinh.com/data/dulieu/files/31091427826.pdf
    • http://interstroy96.ru/uploads/files/mutaronu.pdf
    • https://bharatceramics.in/ckfinder/userfiles/files/65513895471.pdf
    • http://hondasushi.com/uploads/files/monukoxuzamibizukanimasel.pdf
    • https://kenhquangcao.vn/uploads/files/89082223377.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/1dv68osodsgrt187sgkrhhqdqd/45923189132.pdf
    • http://mrspk.com/ckfinder/userfiles/files/27005879511.pdf
    • https://rux-thai.com/ckfinder/userfiles/files/94533596225.pdf
    • http://yeditepegumruk.com/userfiles/nisakafazilixumivujusuf.pdf
    • http://servicedental.it/userfiles/files/pagojisolesanoriru.pdf
    • http://vmkmsz.hu/userfiles/file/silojirizoxeluromipetoda.pdf
    • https://aromamarketing.md/img/files/60331256746.pdf
    • https://stoneappeal.in/FCKeditor/file/resavijisafiputofoliwut.pdf
    • https://krusomying.com/data/file/57898906081.pdf
    • https://debden.org/userfiles/file/
    • https://watosaphotography.com/app/webroot/userfiles/files/20210904_202823.pdf
    • http://nj-rshb.com/v15/Upload/file/2021912648119915.pdf
    • https://demetraproject.eu/ckfinder/userfiles/files/82178501223.pdf
    • https://weborder.cloud/userfiles/file///81635809540.pdf
    • http://chi-kara.net/userfiles/file/1482744193.pdf
    • http://ohmamakitchen.com/uploads/files/sigotalebif.pdf
    • http://tbeaindia.com/userfiles/file/60126779096.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=libro+negro+de+la+nueva+izquierda+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc82.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC82 16792 bytes
font_01_sfnt_off0000e494.bin
f0a6d1c6703bad05fb5e97a9587000ead9bcb1639d015a4b6e42319e6e7b7abc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE494 19316 bytes
font_02_sfnt_off00011599.bin
d4cc58f213f4c8f06846fc830174c430c417f99c23414932aaf1768be60e0819		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11599 10876 bytes

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