Malicious PDF — malware analysis report

Static analysis result for SHA-256 93110fc74565c87e…

MALICIOUS

PDF

72.0 KB Created: 2021-09-16 11:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cc0e3a8b5b1e22d28f1dad6c792bfe61 SHA-1: 7c7ec57951b45f8c5cd82c6501b4c6aa3fb619ec SHA-256: 93110fc74565c87e77d05e475a086d3d7363ca9a7aef3b3b1fb0f54231eb1606
146 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. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. The presence of PRC/3D content is unusual for benign PDFs and further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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://falegnameriacastiglione.it/userfiles/files/1732053015.pdf In PDF document text
    • https://ibericadearmerias.com/file/15362905126.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/23958792351.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/56589340795.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/61373fcf418ed.pdfIn PDF document text
    • http://robbes.nl/media/files/19151193798.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/41971465683.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/75632012419.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/ribuberagiwaxaxagutu.pdfIn PDF document text
    • https://emenu.hu/editor_up/bivereduxu.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/dozem.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/42763132099.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/kabipubolafexisupuw.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/kolugitetapekixixo.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38928847515.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/vazovesuzopesun.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/nipika.pdfIn PDF document text
    • http://aimic.com/userfiles/file/12995718459.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b98830d28---88264364957.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/12280042156.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/bimibineroroviz.pdfIn PDF document text
    • http://jump360.co/upload/files/20210911054325.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/gepakixenuvor.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/wubaguxolud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=action+director+androidPDF 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_off0000bbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBFC 15572 bytes
SHA-256: 8ec32b4e48b4284270a5576ac164e2263c3a402a3386c8655ade4b31e6aadcf5
font_01_sfnt_off0000e372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE372 10132 bytes
SHA-256: d94fdf4d6b199a298625a2ac1c6e05a9d806c0c430c96a01bda0c609daedabce
font_02_sfnt_off0000fa35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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