Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8bd81162d41ec17…

MALICIOUS

PDF

78.2 KB Created: 2021-09-12 23:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0ec5a4b964cea6f33d2a699561b139cd SHA-1: e13de84bead59272efb15101f1283c22c1b8dd39 SHA-256: b8bd81162d41ec17cec0be79079ee4d691c71057e218a31598b6b7072f1aaa34
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of external links, suggesting a phishing or spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://digireg.li/upload/80570782837.pdf In PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/47422775252.pdfIn PDF document text
    • https://norservis.info/files/files/97478041379.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mawugezululezeriwuw.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/42520675016.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/xaniwojarasiwelukagax.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/43524760633.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/dipixijaviruzibaduzebama.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/wogewexaxiborusufeb.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/kejajerotumuzeta.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/winujafodajesirorokomize.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/75814644625.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/raxelemufovidaz.pdfIn PDF document text
    • http://vce34.ru/attachments/file/dagumamo.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/13555590343.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210904081029.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/21790772246.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613871dd94d27---kunonaligijebofijuto.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/84022002653.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/73d6a1b84864f30022604c400ece8ab3/10752809282.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/61964172982.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=cara+menghapus+cookies+di+chrome+androidPDF 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_off0000c9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E9 11040 bytes
SHA-256: 0d51c9e33928f0be73d700ae89da841571a0101e26847f94d318e3a99a3cf5b7
font_01_sfnt_off0000e32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32A 17844 bytes
SHA-256: 559e0595d7018bfe7bafad6804e6b4ea2541c5d2f08d3b85dc49656c469eae36
font_02_sfnt_off0001116f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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