Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16c26d12cf36a3f…

MALICIOUS

PDF

79.8 KB Created: 2021-09-21 00:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 08ac57088842309cc0e171c778255150 SHA-1: c1652ff27401391cf424371f727eefbbf8a23100 SHA-256: d16c26d12cf36a3f62af14ef5bcec588065b37965d8dbf645ec7c1f14717ff09
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to domains associated with link farms and disposable hosting, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics confirm the malicious nature of the file. The primary attack pattern involves redirecting users through these links, likely to phishing pages or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://trubaopt.ru/content/file/17887503404.pdf In PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161350c72bed72---zuforatafefofiniruwa.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/tojopew.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/5349891423.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/zibejepowasesosafapa.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/1889976521.pdfIn PDF document text
    • https://vientangluc.com/upload/files/14324848446.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/5977350316.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/zefas.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/wulavuguzijozalava.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/kigusamero.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/43724371687.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/97173233950.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/kalakopizukuxivetu.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/suborekuxidujo.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/83436533573.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+download+photos+from+facebook+on+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_off0000d1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA09 17780 bytes
SHA-256: cd62f1d07d1b2a888e6076884375f3f3cbcf8e145f6aae0f183e4e7741e9c218
font_02_sfnt_off000117da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DA 11192 bytes
SHA-256: b0067b90f4d0ceec391284d36369ac786c62cb1ae60825b70a20c9f1746dc3d5

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