Malicious PDF — malware analysis report

Static analysis result for SHA-256 6906f0158ee826fd…

MALICIOUS

PDF

72.4 KB Created: 2021-09-23 10:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3533d783a7eb511a52e317b8e02f0ca5 SHA-1: d96caee6842cec3c4fa588de8c8aab61c375d6f7 SHA-256: 6906f0158ee826fd0ec3258c0308d1d662e72297849d5215150d20a52777cdf1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with critical and high severity heuristics firing. It contains embedded JavaScript and numerous external URLs, suggesting it is designed to lead the user to malicious content or download a secondary payload. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for link farms, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://catamma.ru/uplcv?utm_term=pokemon+x+and+y+iso PDF link annotation
    • http://gostinica-domodedovo.ru/files/femuzoredenugavot.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109021105375268.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109210414263569.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/petotafisab.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/77625175808.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210915202929.pdfIn PDF document text
    • http://mps-india.com/userfiles/files/63775851646.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/voresewot.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/luximusoturog.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/xujudamulaz.pdfIn PDF document text
    • https://mmtours.si/uploads/xosotekobe.pdfIn PDF document text
    • http://sgrdpandher.com/userfiles/file/volawewikik.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/dumujajobidokajewati.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/puzadex.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/30057260403.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/lulopovilijunokefojogo.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/ziloponelofulir.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/remujutad.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/rasanaran.pdfIn PDF document text
    • http://kes.org/upload/editor/files/jajisoluzabolejos.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57457544482.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/zuwivazusimufi.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_off0000b5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF9 10476 bytes
SHA-256: eba09d08065c04a0d505cfacf4acf9115773f2db149d81d837db9fc14544bbfc
font_02_sfnt_off0000e5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C9 18092 bytes
SHA-256: 0d4b9492d700a526a64712ca57bef4aac96936c3220a345d45ca20db684dc233

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