Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0aa9cc15be36cfa…

MALICIOUS

PDF

68.5 KB Created: 2021-09-27 17:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3afd549772fac9056ac0e1a1f5520af4 SHA-1: cdcf9c07f8ec07d7ea7b56199844f9506d7b0fbf SHA-256: f0aa9cc15be36cfa6225edc073b8c55eeb5211acf25086f7ea8aabe1c28b9f79
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to the malicious URLs, which are designed to deceive the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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 http://ruihuitax.com/files/file/89092535564.pdf
    • http://l-max.ru/userfiles/file/72853130627.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/fb544a707fe1996d766317006149a1e3/jotajatisozufapidak.pdf
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/gabuwunubazitizijafazid.pdf
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/tutukofug.pdf
    • https://hbphoto.ca/resimler/files/69447699077.pdf
    • https://desarrollostecnologicos.condotiero.com/imagenes/imgeditor/file/tubine.pdf
    • http://tsuiteru66.com/userfiles/file/76853979426.pdf
    • http://cp-1.ru/userfiles/files/tiwulini.pdf
    • http://safeabortionnepal.com/userfiles/file/62830845047.pdf
    • http://nhactheducthammy.com/upload/files/81151074266.pdf
    • https://gencshoworganizasyon.com/upload/ckfinder/files/kelenoxavis.pdf
    • https://jin-ji.com/upload/files/zokilebuvomilezofefipa.pdf
    • http://qishuochem.com/siicea/userfiles/file/40626748670.pdf
    • http://cbcom.fr/ressource/site-image/files/24328965134.pdf
    • https://noble-program.site/js/ckfinder/userfiles/files/43461927953.pdf
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/lelobini.pdf
    • http://bet-balance.com/userfiles/file/lovugevomajijiwuwusov.pdf
    • https://camphacement.vn/upload/files/mibupinet.pdf
    • https://kultmotor.hu/images/files/9821276764.pdf
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1630876768.pdf
    • https://citronel.com/userfiles/files/71135937346.pdf
    • https://soswzgierz.pl/web/uploads/files/kabojewejepa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=be+going+to+vs+will+exercises+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_off0000ad66.bin
4accde21dd67fc10d0006683c3c705aadc7f2a0d9ea6f07c9f207d63bbde3ec2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD66 10940 bytes
font_01_sfnt_off0000c6c6.bin
77de87b44e6bfbdda3a9b4f7a87dddf60301aa2b555211b78026ce3951a76af2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C6 14980 bytes
font_02_sfnt_off0000ec85.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC85 16792 bytes

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