Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f0f0bbc4691539…

MALICIOUS

PDF

67.5 KB Created: 2021-10-02 15:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 4de967362d1cf66f61bc810bc4e6b5b2 SHA-1: 4818a0d14a8ccf3bcb4ab8697a369246e1af9685 SHA-256: 90f0f0bbc4691539bf3e7416d09246a6e0e561a06a26ec85a3a6b77d1145b3a1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm, directing users to multiple distinct domains, one of which is hosted on disposable infrastructure. The presence of numerous unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://metrominicabs.com/survey/userfiles/files/levoxobojamujimux.pdf In PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133bffcb9398---90465216285.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/17173544966.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dobuwezilovivowebesasir.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/nivexit.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/lekabifaredatiwe.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/54153146142.pdfIn PDF document text
    • http://uco-kampen.com/media/files/baxisopiligugukividitafo.pdfIn PDF document text
    • https://hobbypet.cz/files/file/gofipepit.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/xifudemigixuvetemejegobux.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/zarabumo.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/bafefarexiwonakopekeme.pdfIn PDF document text
    • http://demo755.webbazaar.com/uploads/wuluvuluberoxivamuj.pdfIn PDF document text
    • http://iphysiology.ru/upload/46183203996.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/16991195103.pdfIn PDF document text
    • http://araulmor.tel-cor.com/images/library/file/tedajowugexe.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/melegodutazaw.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/pegibu.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/pufejatibiduxiti.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/84494353099.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/goduxipezinokota.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=the+orphan+collector+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_off0000abcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3DD 15036 bytes
SHA-256: 1328f589dd7c567cf623298eee286bcd6c9148be20f7e2cb76e912f5daa001b0
font_02_sfnt_off0000e994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE994 10420 bytes
SHA-256: c0ba2c18c3fa4ad4075978411bd8faea12080fc01e622ff36715d9365bae319b

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