Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac9c6ce908fb4b76…

MALICIOUS

PDF

80.7 KB Created: 2021-09-19 17:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9a243d12170b18a983b1f67bf86ee0b6 SHA-1: 9a54283530afb3a834542c876e297cb2d652029a SHA-256: ac9c6ce908fb4b760fb3a490e54033834b053cc0f9b152cd560f3fa243e1cf38
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior. While no scripts were explicitly extracted, the nature of the embedded URLs suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • 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://drafthe.ru/uplcv?utm_term=dawn+moreno+gi+joe PDF link annotation
    • http://gocoachfox.com/userfiles/file/20810569576.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/58441437295.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/49117513866.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109100701064317.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/vorajogaboxotulelonud.pdfIn PDF document text
    • http://ceroki.com/image/files/52980900446.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/24663744126.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/4771275210.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/51269707307.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/duwabudarivegab.pdfIn PDF document text
    • https://highrise.pl/file/luturujekulerobimakuwak.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/wumilujuxutisenedive.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/litijapeviw.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613604984aa8e---88981672356.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/munerikok.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/32246820869.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/vabevotikezoji.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/61618120603.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/80993600722.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/c2a27f403ce6cec4d974ea7f71e04493/torofifubatofedegabevew.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/15497969935.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_off0000d408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD408 19056 bytes
SHA-256: bb6b45c6cdc61ccb478fc6dc5c68fabd8375b1d3767decbed449297996da1d0d
font_01_sfnt_off00010608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10608 10356 bytes
SHA-256: f7d9667f11aa26e54a3589a425cd5865e2618e2d8cb542d650363d9d3b643ccd
font_02_sfnt_off00011d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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