Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d9ac8f4bed23f12…

MALICIOUS

PDF

86.9 KB Created: 2021-09-11 15:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: d0e6663df02c061190fcbc442a80912c SHA-1: b7969b6066e7de4e42ddcac42fd96bdc434a9cb1 SHA-256: 5d9ac8f4bed23f12b23b6baccbc1c098c19efeb25d6d5890df1fdbf5f5de3b28
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm with numerous distinct hosts, suggesting an attempt to redirect users to potentially malicious content. The presence of many unknown reputation URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://kimcert.org/E/file/38169624412.pdf In PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/5470bf2c1c6cbd5f346ebb9881a295eb/1544232828.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/lenuxugizawibaji.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/mamadutanugeroxoro.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/woruxepori.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/86806037192.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/kitolupavoz.pdfIn PDF document text
    • http://vo23.ru/upload/file/jipozirokudidosalo.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/29030134414.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/10143580993.pdfIn PDF document text
    • http://bamor.org/userfiles/file/67987997169.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/jewidegora.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/73605032686.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/vanowapima.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/jijepeteg.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/delimofogudoxinepi.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xuboforizutu.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/6094050285.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/69606147487.pdfIn PDF document text
    • http://fructusartis.com/i/File/wapavibizavuzisugonilegix.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/45087241119.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613964255ac02---zukoni.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/jesopolorofap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=follow4follow+instagram+freePDF 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_off0000eec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC2 10696 bytes
SHA-256: c9100b94b9de5dd78531ed351ae6bf4129d2a41ce864dbfea040599fa0c8ec8b
font_01_sfnt_off00010765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10765 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F77 18008 bytes
SHA-256: ddd201e9f708d8b9549be149c51f2a1ad82347d65f9eb8975f66957e1bd02752

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