Malicious PDF — malware analysis report

Static analysis result for SHA-256 772e07eb88700c54…

MALICIOUS

PDF

75.6 KB Created: 2021-10-11 23:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 03d5e13b455dc0883c7b78dfd04f0dce SHA-1: fda8c1f39926a0fbcb6679407c4ead5eb8a5254a SHA-256: 772e07eb88700c54747337e86f73b8647d6a3d5dc89e204d0e007e60fcf0bfa1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, as suggested by the PDF_URI heuristic, which are often used for phishing or downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sergeybazarov.ru/file/kuziwidibadivubusozefezu.pdf In PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/94936561371.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/kizaparenujadewugepadanik.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/55262462633.pdfIn PDF document text
    • http://xfswchem.com/upload/files/76178687135.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/61740234614.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/visigodon.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/78932917988.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210924205003.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/56949762676.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/78885136262.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/31943721977.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/787995201.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/pozozux.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/dekugisozopuxew.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/luxamurilinalovina.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161370ecbe0db4---40773873465.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/xososudoxonexaxugiko.pdfIn PDF document text
    • http://erex.hu/upload/file/27204789491.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/lovonuweti.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/telanozesamedukepulimava.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/96771696452.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/mipibeluwufalotitisafotev.pdfIn PDF document text
    • http://synfarm.com/upload/files/47397500983.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/KGDyd8lM0uI/uplcv?utm_term=how+to+change+quadratic+function+to+vertex+formPDF 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_off0000c20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC20D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA24 11200 bytes
SHA-256: 749fe9b42ccd1df88c121fa89c93e25c0a3f3e41899323b69d604c43afd54e7f
font_02_sfnt_off0000f3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AD 17092 bytes
SHA-256: 28a93f84cab393e89c8f5b2a68165a2e054f428245749ada859f6023ebfac2cf