Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d045516b32a963…

MALICIOUS

PDF

80.5 KB Created: 2021-09-10 17:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a7cd8f9f5309706725cb2ffc2f57f41c SHA-1: ca8151758fcd1329c36cdac21f97210b2db91404 SHA-256: a1d045516b32a963a48519e1bc07df086b7780180bbacbc5a8829447d2eb8659
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic further supports this, indicating the PDF is designed to redirect users to various external sites, likely for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://drafthe.ru/uplcv?utm_term=basic+accounting+textbook+pdf PDF link annotation
    • https://damsindia.org/admin/uploads/file/60147168198.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/59555244723.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/75331364009.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/xemosem.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/79455161640.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/97207273544.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161378ada9a1d2---17495072235.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/kilomibuwo.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210909021349.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/7213c1181e347f80af21145eaea4be36/wawokijukexowerinaranid.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021090204463686.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/69016328747.pdfIn PDF document text
    • https://el-tall.pl/pics/file/gevux.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/nivazali.pdfIn PDF document text
    • http://leruichem.com/upload/files/soripowoxinudagigijoveja.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/90454105354.pdfIn PDF document text
    • http://youil.org/userData/board/file/25431354460.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/lodejedubudafuvuzufek.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/ripexavo.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/18884540797.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/konigufubaxiwagudasewa.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_off0000d5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C1 11136 bytes
SHA-256: aefa74bc29f9562f91d63b8c8bcf13ce244c3ee0bc4c38b8f4db728e6e4f37f8
font_01_sfnt_off0000ef96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A8 17520 bytes
SHA-256: db59dc579acc34626478f4f57489fe53f735856d1d7d2f0de03fbadf638dba85

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