Malicious PDF — malware analysis report

Static analysis result for SHA-256 0573f68c64feb34b…

MALICIOUS

PDF

78.2 KB Created: 2021-09-19 08:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 459323293c8ca12b36559cc69a6a6812 SHA-1: 91870d557fa764815e92b34b86447a5c14f97052 SHA-256: 0573f68c64feb34bd61c78c414fc024a45ca7b301efe159ccbe09e0d5ae64e64
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also exhibits characteristics of a link farm, with numerous external URIs pointing to disposable hosting, suggesting an attempt to obscure the final destination or distribute payloads. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6141

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://catamma.ru/uplcv?utm_term=types+of+emojis+on+different+phones PDF link annotation
    • https://devcons.org/uploads/userfiles/files/fonuxowogobewagomisiluvef.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/zafujeko.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/55630387128.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/20460869734.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/33293173024.pdfIn PDF document text
    • http://sakem.org/userfiles/files/xosasiwatedotonudazerer.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/pominowosif.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/rasubaximak.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/lejevu.pdfIn PDF document text
    • http://leeandrewdavison.com/download/zisoxakujo.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/17136397182.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/vatuxadafaxeposux.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/tadaruvetabiselogibon.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/e769148e509f006640812f01a4524a95/ropakobibute.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/gorupudimawijamovotu.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/dixosonakurag.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/gufamek.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/31989407582.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/40854192119.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363eef43d40---63589070056.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/nojexa.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/ruzabafapuxuzimid.pdfIn PDF document text
    • https://collinite.pl/userfiles/file/tozagesefugi.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/dipovujugorasirawepar.pdfIn PDF document text
    • https://mediacentre.aerlingus.com/js/ckfinder/userfiles/files/1830437534.pdfIn 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_off0000d890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD890 18208 bytes
SHA-256: 5ca974b5582a3123d09c2837c9954e6ac4a33e15c22ba8907459a67e9759cd63
font_01_sfnt_off0001071b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071B 10760 bytes
SHA-256: 01d77e1191e08bfea8dd7ca1954eeea1103b0fc477984010de6081fbffd6510f
font_02_sfnt_off00011fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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