Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c97eeeac2c6a6a8…

MALICIOUS

PDF

72.9 KB Created: 2021-09-20 01:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d2161a563938042526f8dca8ba6649b3 SHA-1: 86aa2f0664cc0f44c3f084122b7734875407e4e5 SHA-256: 6c97eeeac2c6a6a8926d3664e610b75eb22921ca9a3c83ac799f43acd52efaae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to potentially malicious domains, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple links, suggesting an attempt to obscure malicious destinations. While no scripts were explicitly extracted, the nature of the heuristics and the ML classification strongly suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://carbontuning.ru/file/guroviwupesuvo.pdf In PDF document text
    • https://solturism.ro/images/file/9554842347.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/geten.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/27162223149.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/11199225309.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/noxedosex.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/muwokixojufoku.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/bogonarizazi.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/31009030798.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/kiruwixadonuvonemif.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/kataz.pdfIn PDF document text
    • http://ux-school.ru/files/files/nisomuxofobi.pdfIn PDF document text
    • https://anup.bo/images/files/tamifedunareb.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/53437727253.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210903185531.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210916110529_ig43ds.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/55736605064.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1733f1884---1435007375.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/011706093510.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/69249201224.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/45870106303.pdfIn PDF document text
    • https://majubesar.com/contents/files/37798218710.pdfIn PDF document text
    • http://kaitianjinghua.cn/admin/userfiles/file/202109130355075134.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=video+converter+apk+modPDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/xovaxav.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_off0000bab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB0 10588 bytes
SHA-256: c13d02a0ff12f5d4de09418358a1e347c41fbea6dea94f8ac0d1a5f7bd1d1fbb
font_01_sfnt_off0000d2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DA 16868 bytes
SHA-256: 1eb02902940f3a14d9501030ea4ed0364d148f74d215865697adcc98bdf8bc44
font_02_sfnt_off0000fe6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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