Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bdec6fa349df77b…

MALICIOUS

PDF

79.7 KB Created: 2021-09-09 08:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 708b88e3973b172fd9a5abdf2f963dc7 SHA-1: 54f319e6becb6a873b6a7c62fb022ca20cfb384d SHA-256: 9bdec6fa349df77b561093f1ed0b928b7dc6aaeb103257d33d4f41079133f477
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It also contains numerous external URIs pointing to various domains, many of which are classified as unknown or potentially malicious, forming a link farm. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high number of distinct, low-link-count hosts, suggesting a tactic to evade detection. The embedded JavaScript likely facilitates the redirection to these external links, contributing to the overall phishing or scam objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://thucphamtruongxanh.com/Upload/files/dulafaminujunita.pdf
    • http://esrafisek.com/images_upload/files/fevimigidusawijixelefek.pdf
    • http://intimatehotelpattaya.com/image/upload/File/6852071774.pdf
    • http://aodaiminhhanh.com/app/webroot/uploads/files/gapakumuxikotoxerofatig.pdf
    • http://gatewayhotelbangkok.com/upfile_hotel/files/jajotusaro.pdf
    • https://cantarefides.ro/admin/userfiles/file/84979372051.pdf
    • https://edex.co/userfiles/files/23563861989.pdf
    • http://vhktn.at/images/content/files/robaganapomad.pdf
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/35316785010.pdf
    • http://efcosmetic.com/uploadfile/files/julumebinozaforakaruv.pdf
    • http://gangwonbnb.com/FileData/ckfinder/files/20210903_C6934E107583C1E6.pdf
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/26058328809.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef7b262988---pebosuvowemopikowikug.pdf
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/sunumab.pdf
    • http://diennuocdanang.com/uploads/image/files/55660122024.pdf
    • http://vinczeandlaszlo.com/upload/tiwesaterulukobuvuk.pdf
    • http://kantoromega.pl/userfiles/file/joravatupolesotitoraditub.pdf
    • https://designclarf.it/file/21101659769.pdf
    • http://yaqeen-eg.com/userfiles/file/gopaxoduzebuvafa.pdf
    • http://dayuntang.com/assets/uploads/ckedit/files/20210907172336.pdf
    • https://megacook.pt/site/upload/file/sadaronesur.pdf
    • https://hainutedecopii.eu/ckfinder/userfiles/files/2032668190.pdf
    • https://nichecnk.leaddeehub.com/userfiles/files/5010516430.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+transfer+files+from+android+to+pc+using+wifi
    • 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_off0000d1ad.bin
0cce22a8af07e586ae8e1c08083846684b65dc935d48c06792e0af1d1f4af7eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AD 11140 bytes
font_01_sfnt_off0000eb7d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7D 16792 bytes
font_02_sfnt_off0001038f.bin
466b24cfabec432812a67e19b7b5ba1548d77ba443f60d07fc253609db69391e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1038F 17284 bytes

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