Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e36b5d15f8b05fe…

MALICIOUS

PDF

71.7 KB Created: 2021-10-03 20:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7f5bd856ef9f69856eb8e540414f95b7 SHA-1: 003c14cede90bd9c589eda3b3bf1199d494de468 SHA-256: 6e36b5d15f8b05fe96e64f0e22d3af2f05dd90f1aae269c448556917b879bbdd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs that point to a link farm, suggesting a phishing or redirection scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to host many links on disposable domains. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing attack designed to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82963989313.pdf In PDF document text
    • http://qapoll.com/2015/vat/upload/files/roril.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/nejet.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/gesibesifasilobitivalo.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/kiteriruruzuzupe.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/50816138591.pdfIn PDF document text
    • http://xn--xhq021fvrwdth.com/d/files/jemobomogoduwodupo.pdfIn PDF document text
    • https://demoepaper.104portal.com/upload/serback/files/20210927042516.pdfIn PDF document text
    • http://gugugroup.com/userfiles/fudopuvarugutajixazafari.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/porejikademitisuzajoxuri.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/52586040103.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20211002025915935.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/10219239873.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/11025680624.pdfIn PDF document text
    • http://ana-jsc.com/upload/files/kelizenuxulexafumetus.pdfIn PDF document text
    • https://scout-educationguide.com/userfiles/file/75889679036.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/segas.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/5b186fe49d96e135478013df49425cec/76959202107.pdfIn PDF document text
    • http://preiss.at/upload_files/files/89506237243.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/4f7bbbdb467a6865dae5cd8d2e6f71db/poxenuvifekeparitotizomim.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/80323026685.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/91660086653.pdfIn PDF document text
    • http://business-baltic.com/myfiles/dok/47508169073.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/kebewoxemolug.pdfIn PDF document text
    • http://hoachattn.com/image/files/mekugefazagepakupagel.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/visiramosuta.pdfIn PDF document text
    • http://falcon.dk/sites/default/files/webfm/ratuzuvamisawaduluged.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=ps5+game+restockPDF link annotation
    • 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_off0000b6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B3 16508 bytes
SHA-256: b9f1f3395f71d85989e66849c28c876a65224db4e3141cda989a88917f653e25
font_01_sfnt_off0000e0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C5 10560 bytes
SHA-256: 972b5e322567e929e3c55f6ed1b9deb34edf46a1d63b4d3bc966f10a1b9d2d9b
font_02_sfnt_off0000f903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF903 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1