Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dd17c49b2c02979…

MALICIOUS

PDF

90.9 KB Created: 2021-09-18 18:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5437e3bda56c6a1f7b65dab38f5f7f15 SHA-1: f0fe4febc037007d48bd5cffa2bcf62c7e5c95bf SHA-256: 6dd17c49b2c0297956d45d8cbac0e013a53d5aedb39cfa91c0ce118af1e038f6
166 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document's content is designed to trick users into installing malicious browser extensions or updates. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme. The presence of numerous unknown URLs further supports this assessment.

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
  • 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 http://adabaskimerkezi.com/upload/file/lemibedat.pdf In PDF document text
    • https://suprastoc.ro/userfiles/file/fupevijavanupitinepuv.pdfIn PDF document text
    • http://precisao.net/files/files/lalekexidufos.pdfIn PDF document text
    • https://simorgh.it/uploads/file/52194610677.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/79880165497.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/nawowuxusifoninirevo.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/wixotojosuxefirixopofetix.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/93252621675.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65244027502.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613910836d61a---vokugozeminakabisenef.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/afdcd4be6a19bdb0943c423135c184b7/45685952338.pdfIn PDF document text
    • https://pixel.bg/img/file/jonibufejujozosirubipi.pdfIn PDF document text
    • http://lse.hu/userfiles/file/negijuvevip.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/16602410520.pdfIn PDF document text
    • https://deepex.hu/hirek/files/48263375662.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/37008073852.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/85050366336.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/94426155037.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/u44jj1gn3hfe6og7lui9gio625/6960571318.pdfIn PDF document text
    • https://renault-service.com/userfiles/77473414951.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/69862518673.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/89976213754.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/sugegiwasozagaduf.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/newanizuxoruwumonebel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=robux+codes+without+verificationPDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/limasojonegatanewira.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_off0000faac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAC 11068 bytes
SHA-256: de832f686f0079e38b2438351fcd9f59cd36fbf1a9a595763cb062bdb92620ed
font_01_sfnt_off00011485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11485 18952 bytes
SHA-256: 69ff5a32c73868ee65b99bc9ecf2dac68c12e6a5766ba05661784f8fd34410a9
font_02_sfnt_off000145d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1