Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b9bc80a50bac0e…

MALICIOUS

PDF

93.6 KB Created: 2021-09-17 22:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8f79a369febbfe4bbbad465e5c1e461b SHA-1: a788a4d8042aee9b056cc013ec5c0db44a8912a1 SHA-256: 09b9bc80a50bac0e90ffdefcb55b043074a25515910619b155ac5b6a29dacd92
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external websites, many of which are structured as link farms or disposable hosting, suggesting a phishing or malware distribution campaign. The PDF structure and embedded URIs are consistent with common techniques for luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 5

  • 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.
  • 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://laborke.ru/uplcv?utm_term=mecanica+de+grupos+pdf PDF link annotation
    • http://dailygameresult.com/editor/UserFiles2/files/xukivu.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/zowevuzatis.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/jazivutopimire.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/14786989044.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/28564772058.pdfIn PDF document text
    • http://teplospectr.ru/images/files/waxis.pdfIn PDF document text
    • https://senegal4d.com/contents/files/dekisodep.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/tovuxopufuwodifo.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/65307597916.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/gokukedodonuna.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/55468081112.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/kezivuparo.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/wesituxanuladenonol.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/xorigedakonuz.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/rawidusutiwofufuk.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/vipopobapudoxe.pdfIn PDF document text
    • https://membermimpi.com/contents/files/12733865969.pdfIn PDF document text
    • http://www.polni.si/Images/files/34780405585.pdfIn PDF document text
    • http://mweb.cz/images/file/bujasa.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/16395295918.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/joveguziraniv.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613e787dc1904---dukababagure.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/vaxemaduzomisu.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_off00010546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10546 20012 bytes
SHA-256: 0212356aff5c2fd58c19e6ca62da1183a92dfc632a979ad1d84df3d70062b4de
font_01_sfnt_off000137f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F7 10744 bytes
SHA-256: 9cce10ebddb8b79d8fd1e4a1b1a24253f7b98a51dba39ae082001a2d76183ce4
font_02_sfnt_off0001508d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1508D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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