Malicious PDF — malware analysis report

Static analysis result for SHA-256 13c8be71113f8e53…

MALICIOUS

PDF

79.8 KB Created: 2021-09-09 00:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: f5b591f0844bb939b173d7bbe9d55cf7 SHA-1: d8e8fe46f929e2179c19bb7de7d764f395f30269 SHA-256: 13c8be71113f8e536d405b5f940d7802d8b445afa66df0fb52d4b024d4fd22d6
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The numerous embedded URLs, many pointing to suspicious domains, suggest a link farm designed to redirect users to malicious content.

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://szintai.hu/ckfinder/userfiles/files/89205908670.pdf In PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/sifarozikedelajimi.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131b8fb353f8---96145510216.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/43023527065.pdfIn PDF document text
    • https://uudanbury.life/files/file/koworodurodopukomovanuzi.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/rizijepotofivuzew.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/tafazolevututizuw.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/79770069474.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/96092251836.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021090410215285.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///83663829331.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/jaduxadafidavomaw.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/zikawoniwavuwo.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/wujigumoremoxawexibavov.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/jewagokip.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/12251840381.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/jamafogimemiseda.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/44959335776.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/dugivomibiteronupiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=como+quitar+modo+seguro+samsung+s4PDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/18810555150.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD062 10900 bytes
SHA-256: 01334c55e9d06f2c65713957508a596d2d881e9774b7b40367c01189cc0ee62b
font_01_sfnt_off0000e91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91F 18852 bytes
SHA-256: 3b7c13ea3d1f49cc5ab8e6ff26dbf2e485de21ba15c9293573599acef731a2ee
font_02_sfnt_off0001196f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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