Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd86ca05c73dff40…

MALICIOUS

PDF

79.2 KB Created: 2021-09-21 13:24:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 37d93895e42c63b077dab4bac1f9109d SHA-1: 289a7c4d64aa37e0d10dd149b8d8bfb73312cf40 SHA-256: bd86ca05c73dff40a18f6f9933d852680dde351b6d693728adf4ed7ff877f5c9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features a large number of external URIs, many of which are hosted on domains that appear to be part of a link farm, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of JavaScript and numerous links strongly indicates a malicious intent to compromise the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://valsadindustries.com/userfiles/file/97695034121.pdf In PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff8436caf1---lukizogigefetuku.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/4272351519.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/jijepoj.pdfIn PDF document text
    • http://artdental.hu/editor_up/fimeka.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210908195037532407.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/3928921516.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/sapusetisobukitibifisaxu.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/lexigazafukone.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/39932572950.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/18558520424.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/91916947869.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/jasonapevovetuxebisageb.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/bisikujadebu.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/67750214791.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/59029994756.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/42213405875.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3504a286b---28473689286.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95333670420.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/vorojarinosame.pdfIn PDF document text
    • http://schubert-hh.de/image/file/bopejajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=7th+class+math+key+book+pdf+downloadPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/fuzovafigugu.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_off0000cf50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF50 11080 bytes
SHA-256: 668c4c04a4f49f1522d56e702d22109b9b723f4a9e746eede28bdd502bbbc40c
font_01_sfnt_off0000e8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E7 17652 bytes
SHA-256: 4880f19781c959c614da8bd587ce229e047c071457bcc527d13e193d3874b3c7
font_02_sfnt_off000116cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1