Malicious PDF — malware analysis report

Static analysis result for SHA-256 0349802881db2e2e…

MALICIOUS

PDF

81.7 KB Created: 2021-09-16 15:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c3f5898b2d46ba9e11d0d43b7bb5ea6d SHA-1: 3ede4803662a3303bb0b509df14c057ca9a354fa SHA-256: 0349802881db2e2e53c0b6a47a5a244256413e01c933d7a22d54d091c71b9648
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and an ML classifier. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document's content is designed to trick users into installing malicious browser components. While no scripts were directly extracted, the PDF structure and embedded URLs suggest a phishing or malware delivery attempt, likely involving a social engineering pretext to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://yocarbroker.com/upload/ckfinder/files/lijagezabosavedut.pdf In PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/zegavobubijagezemuwi.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/26179635948.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/jadiweza.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/53111945730.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/1628771096.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/tudajewafamitobaka.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/moxisetexelajid.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/bazikanarinupazusevubobe.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109051134326993.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/javedevogijarudilozoka.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/36246265574.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/5030697558.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/zuliwetoze.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/lunimifibexikozifibosumi.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/lixug.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210910023711863965pgix0.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/0d6848ad7c3ae773b28811dd0275da90/57167818161.pdfIn PDF document text
    • http://ellev.fr/upload/files/rebikomufaderif.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614174b1607a8---ximojubedumumilevalekil.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/fonotuvipazisijupik.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/11106900036.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+block+webpages+in+chromePDF 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_off0000d919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD919 18056 bytes
SHA-256: e948d36b9c6935959a2482c268c25e0cd7ea9244ff0a17e0b623a480e3d9e1b9
font_01_sfnt_off000107c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDD 11132 bytes
SHA-256: 80cc92fce0305b317ddb288b4e0809621f116bc0ba9b4a5e9afbf7ef579a58f6