Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2bbfd72384722c3…

MALICIOUS

PDF

79.6 KB Created: 2021-09-23 14:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6330ee51b514eb6e203a81ee540ae3a1 SHA-1: c66c04ba5226824d7e29d45b797dc0bb481d9eea SHA-256: b2bbfd72384722c35ef23cff263d93cc2f0349cee9d9121c5f2c860f2a2e4c9a
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, suggesting the document's primary purpose is to redirect users to malicious sites for further exploitation. The embedded JavaScript likely facilitates this redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7083

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.
  • 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
  • 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://opuspointpartner.com/ckfinder/userfiles/files/46349396419.pdf In PDF document text
    • http://stringquartet.biz/web/images/fck/file/degojakebemasuxonexoruvi.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/soxapolo.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/56847918950.pdfIn PDF document text
    • https://elemonbg.com/Files/File/78454489187.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/60682374483.pdfIn PDF document text
    • http://xn--2-7sbddqrtdw3be6jua.xn--p1ai/userfiles/file/xuviso.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/65427463033.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/66157424352.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/12142634033.pdfIn PDF document text
    • http://gr-chem.com/upload/files/95275894001.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c36798f9fe---konebomewuvawibutuweroj.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/kisonitugap.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/sazawipitezitarojo.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/begito.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/27740602472.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/45978095561.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/18447780270.pdfIn PDF document text
    • http://trubaopt.ru/content/file/81631204645.pdfIn PDF document text
    • https://csodamalom.hu/files/files/45925317873.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/budepizagenulepim.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/fopeteluwuxigi.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/sujuzibumit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=add+location+to+google+maps+androidPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F63 17140 bytes
SHA-256: 56ea6db20a55d280a85972b9329d8fb84458f179b32b0120aefa8712482759b4

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