Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ed4402e5b771e21…

MALICIOUS

PDF

83.3 KB Created: 2021-09-23 00:28:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 31bc51f9a306a49e8a83c858cdb8b582 SHA-1: 0ff00531c815399fe3c07d6195c17e863daaa7ac SHA-256: 9ed4402e5b771e218ec230c35a612d30a15ba4ed99cc152371350a2ff04b1b1e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is described as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful websites. The PDF structure and embedded URIs point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=redmi+note8+pro+gcam PDF link annotation
    • http://softtox.pl/new/userfiles/file/18540187220.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/vebidukidamotirunej.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/57653272418.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/14695176225.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/dapalatamuridaf.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/69821177733.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/3858676306.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/161479aabe6c4c---20669027011.pdfIn PDF document text
    • https://www.ocnistudio.cz/ckfinder/userfiles/files/31082583431.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/96771094034.pdfIn PDF document text
    • http://bamor.org/userfiles/file/67987997169.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/12922312633.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/13885417605.pdfIn PDF document text
    • https://506hlapeta.com/files/file/29906283767.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/relizexo.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/76820568983.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/87932783842.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86837061834.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/0e312a862e4220d26d0a2bd95c1ccfdd/85806754373.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/48347517204.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/5684914098.pdfIn PDF document text
    • http://soles2walk.com/data/file/31631181997.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/65236332754.pdfIn PDF document text
    • https://karjerastests.bankai.lv/ckfinder/userfiles/files/pakedaravelolog.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_off0000df3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3E 10896 bytes
SHA-256: 333f4f63e855de73679818da7badb60bd7383d07b7113ba2fec6af56f26431e7
font_01_sfnt_off0000f83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001104d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104D 18200 bytes
SHA-256: 7be29db520023aee512fed0551c61e5bd2f8bbc5aae520d1261657b377ef1297

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