Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbee3db66e03984e…

MALICIOUS

PDF

72.9 KB Created: 2021-09-17 07:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b7f5113c3880e43f41cbe8e4a0de6f4 SHA-1: 6ce51bfd1fb9f9cf8b61b898db1320dbc5a02566 SHA-256: cbee3db66e03984e54d7e2bf6f8eb4d4d5cd0f14b6a0c2f55b0ba561c338f26f
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the presence of embedded URIs and the nature of the link farm heuristic point towards an attack pattern involving directing users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://synerhu.ru/uplcv?utm_term=gba+rom+download
    • https://yam-token.com/business_school/uploads/file/70500272456.pdf
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/48660128479.pdf
    • https://sogelec-eng.com/files/ckfinder/files/tudexozud.pdf
    • https://coffotea.com/uploads/files/202109120901534317.pdf
    • http://kondicionery-domodedovo.ru/upload_picture/file/ridogazubopewobuzobus.pdf
    • https://plagij.at/ckfinder/userfiles/files/xolalananukevujomew.pdf
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/tukikaxazotitizi.pdf
    • https://aquaprosmart.com/userfiles/files/89396509670.pdf
    • http://dreamwith.gni.kr/ckupload/files/gotuzelogapagozowatawigod.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423c2d64f26---keridix.pdf
    • https://jeneifogaszat.hu/cikkdata/files/25887076493.pdf
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/88728712611.pdf
    • http://sxhk365.com/uploads/file///sedapenelowu.pdf
    • http://pro-group.ru/userfiles/files/87279904478.pdf
    • http://abwcolley.com/uploads/files/75816185707.pdf
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/77012197268.pdf
    • https://camerabentrenet.camerabentre.vn/ckfinder/userfiles/files/wibow.pdf
    • http://eltprof.ru/userfiles/file/66701449524.pdf
    • http://ulv-fogger.ru/d/files/zaziwilenerabomiroso.pdf
    • http://vilocom.net/webroot/img/files/49298922522.pdf
    • http://zlzljc.com/uploadfile/file///2021090205154125.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614298c8a5927---45785890963.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_off0000bac5.bin
f780566e8b9e12791fbf22aa43fe25d7085e7ddc20475067ddb7028ebdb4ac24		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC5 10184 bytes
font_01_sfnt_off0000d190.bin
4db17b31a275593ab6bf5e706e33fd297e80e5589c2dba628f8d55c63b184452		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD190 17168 bytes
font_02_sfnt_off0000fe5c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5C 16792 bytes

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