Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfbeb7cf1005872e…

MALICIOUS

PDF

85.9 KB Created: 2021-09-13 02:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 04c5503963fae97ee7b4096ef39db459 SHA-1: 47e46a73fe6fbd202836504829191ee6e68b277b SHA-256: dfbeb7cf1005872e0b6ca62612858d69ea9a177506e7f81c6120faeb3eea18a3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to disposable domains. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, suggesting it's not intended for direct user interaction but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://plantessentialoil.com/upload/files/79046120871.pdf In PDF document text
    • http://logistra.fr/ressource/site-image/files/tuwaveritozigonowowige.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/bijeduwemegojitodezizevo.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/xavaba.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/pijebitisefulukesomoz.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/91593530474.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612eff06bbdc8---rugizumimux.pdfIn PDF document text
    • http://bankerz.in/qpic/files/pugefakosidudinudiru.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/8325023773.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/80615987150.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/romomuvexoxozemeserixuf.pdfIn PDF document text
    • http://www.agot.pl/upload/file/74517400018.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/73024621162.pdfIn PDF document text
    • http://1careglobal.com/upload/files/likixaramefowijedabufu.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/95862846097.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/xenojeka.pdfIn PDF document text
    • http://kyea.org/imageuploads/19359644463.pdfIn PDF document text
    • http://trieuduong.com/images/Download/95022853282.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0ee18f7e5---xovebuvozowu.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/99469289481.pdfIn PDF document text
    • http://sunridgecorp.com/uploads/files/202109070007054743.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/limedojo.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/9415851129.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/magosilotegabusawuz.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/wokevoxiworulimemu.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/69960003840.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=excel+line+chart+multiple+seriesPDF 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_off0000e9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F9 18280 bytes
SHA-256: 1c7d76e699392d16b3472633dc2fbe70d5fa1ffe0c0f410ebdbf26715f936841
font_02_sfnt_off00013157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13157 10704 bytes
SHA-256: fe5bf86d5f1113642654284908f6670a08bd77f69c36e95d1846357d15b9ecc5