Malicious PDF — malware analysis report

Static analysis result for SHA-256 d263e688b52bcdff…

MALICIOUS

PDF

73.7 KB Created: 2021-09-21 16:35:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 25629577ce3f9225adc12c5ac281a430 SHA-1: ee37e6dc8a62c0064f55baa5a4c8949400354b69 SHA-256: d263e688b52bcdffff24ac285ada8e67aeea9365e36a7cb0d04f79b27d0b7777
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is flagged as a link farm, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crewmak.ru/uplcv?utm_term=filmora+mod+apk+no+watermark+download PDF link annotation
    • https://omprintandpack.com/userfiles/file/vazawabajaroxuwugawo.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/senojigu.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/fiwufonezeg.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/38600318586.pdfIn PDF document text
    • http://rentator.com/uploades/fckeditorfile/zevirojuwobegexutepuno.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/46930479092.pdfIn PDF document text
    • https://senfina.top/uploads/files/pivaj.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/31334373231.pdfIn PDF document text
    • http://ptk-tent.ru/userfiles/file/lowiwifawe.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/87382868592.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/73144650152.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/38980857331.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/62163810772.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/wokudetuxo.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/ziporoliduvabuxe.pdfIn PDF document text
    • https://polandpools.com/contents/files/80272995891.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16140c69a27e26---963518085.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/64596574617.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/3331437477.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/71340227365.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/67241889324.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/wakibomexoxim.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/40034438252.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/4105370118.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_off0000c041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC041 10540 bytes
SHA-256: 2b55164d8b0e4cadd24f36cbd653fcf025cfe12a1ad7b2a5f31b577f53285161
font_01_sfnt_off0000d836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD836 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF048 15956 bytes
SHA-256: 7385cd07871ced6a0e9af85d73cd8e0541c2ec24bd0b0ea6df7d96e57688f34d