Malicious PDF — malware analysis report

Static analysis result for SHA-256 c449fd08668f64c8…

MALICIOUS

PDF

81.7 KB Created: 2021-09-08 15:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5e9f9f73aa61460c173739cd212e7412 SHA-1: e02131bdd52e3fcbd8901f8edc27ae34ed7e97a7 SHA-256: c449fd08668f64c807786460912a52fa89c15fe4f02c7b13e3f8df5bd7bc5378
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable domains and form a link farm, suggesting a phishing or malware distribution campaign. One URL directly uses an IP address, indicating a potential attempt to bypass domain-based reputation checks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://vimbark.sk/editor_uploads/files/89108547245.pdf
    • http://cerescommoditiesltd.com/Images_upload/files/6403213250.pdf
    • http://vietkinggroup.com/uploads/userfiles/file/55733536273.pdf
    • https://torbay.ru/images/uploads/file/17502996740.pdf
    • https://dhrc.in/userfiles/file/vujetowagatisovugigu.pdf
    • http://planao.com/ckfinder/userfiles/files/73775568164.pdf
    • http://fivelscope.net/fckimages/gomuterojegoxipofijog.pdf
    • http://www.asiacoservice.com/file/files/69365354108.pdf
    • http://185.33.116.145/~acus01/upload/files/nepuduputuwodaj.pdf
    • https://aslimitada.com/userfiles/file/54419301261.pdf
    • https://lwim-ouargla.dz/ar/files/79378541279.pdf
    • http://changrung.com/ckfinder/userfiles/files/gomedusakewotikaxelegupe.pdf
    • https://superpart.com/files/tiboxafebuvit.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131dd2016348---5839363862.pdf
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/66295691539.pdf
    • https://davidfoleyinc.com/userfiles/file/59531318259.pdf
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/tozenanazi.pdf
    • http://thoitrangvabaoho.com/Images_upload/files/tawufewaw.pdf
    • http://putzlappenborner.at/editor_up/vixivimosebamili.pdf
    • https://thefertilizergranulators.com/d/files/vevukemoziroruwanak.pdf
    • https://506hlapeta.com/files/file/20689421361.pdf
    • http://ediljolli.com/userfiles/files/15645632217.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=pasteur+marcello+tunasi+livre+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_off0000d262.bin
4bc14b8dd0a8cb26bfe0a4b6a0deb80b2f366d4ce1186ac5d8e7d9db45f3a91a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD262 10948 bytes
font_01_sfnt_off0000ebca.bin
fa94b2fb8ff52a37207e427da37c04b46130753353178cd21191d05eaba5c997		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCA 20536 bytes
font_02_sfnt_off00011fe9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE9 16792 bytes

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