Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffd21b6f5f8cb785…

MALICIOUS

PDF

82.6 KB Created: 2021-09-23 05:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b9a90b360af953df0882814c3b1f7bb2 SHA-1: 6ad6968bef11879f4acd77cb28643ecc66c539f2 SHA-256: ffd21b6f5f8cb7855beaac6b7fcca04369c48a275fb40b8719454db47dc920f7
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 probability of malicious intent. The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://krisoc.ru/uplcv?utm_term=sleep+as+android+accuracy
    • http://improntediteatro.it/userfiles/files/18123097906.pdf
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/43478915807.pdf
    • https://kalashad.com/userfiles/file/riboxo.pdf
    • https://rowsontw.com/shopadmin/upload/files/70454722401.pdf
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ruronanitawujatalufo.pdf
    • https://immo-macedo.lu/userfiles/files/taxegofulinapuwenatetiza.pdf
    • http://studiogeologicotrilobite.com/userfiles/files/41942662432.pdf
    • http://poexali.org/static/image/_u/system/files/33237912499.pdf
    • http://artstudiodesign.it/userfiles/files/visuzekotuxuwen.pdf
    • http://chinalabware.net/d/files/28462810311.pdf
    • http://dirpub.org/editor/ckfinder/userfiles/files/57928614414.pdf
    • https://ka-base.no/images_content/file/77291157309.pdf
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/lafogifesamojifiwa.pdf
    • https://medsplus.us/admin/images/file/28245427996.pdf
    • http://mrybalko.ru/files/77293118666.pdf
    • https://macauroommate.com/ckfinder/userfiles/files/75906488357.pdf
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/raturewagamo.pdf
    • https://threadworx.com/thread/admin/uploads/file/bibal.pdf
    • https://ladachess.ru/userfiles/file/16088545976.pdf
    • https://medsplus.us/admin/images/file/mugolixorojarive.pdf
    • http://jualumnitoronto.com/editor/uploadfiles/69242851850.pdf
    • http://baracenter.be/userfiles/file/33972659314.pdf
    • http://skia22.ru/pic/file/degowewarok.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161461ed747ab9---golozuturomobomud.pdf
    • https://gestionarival.com/userfiles/file/65172246458.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_off0000dbaa.bin
e0eaba197a54973c08aa5c0dd6131a736e88e82117b2e25c33747bbd1f6c2c33		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAA 10700 bytes
font_01_sfnt_off0000f447.bin
40856861d80c0bbb59a6bce10298e7e3bc8c5da5881fc253935ddefc2435108a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF447 18024 bytes
font_02_sfnt_off0001230e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1230E 16792 bytes

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