Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7eb4cb7c022d179…

MALICIOUS

PDF

76.8 KB Created: 2021-09-22 11:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 660e3aa0e0c4584d3c62897ba4cab6d5 SHA-1: fc400f61a3c429f87200b9a48e3eb37c779101c9 SHA-256: e7eb4cb7c022d17914466d5e8f0977fbb6b791b4b8182b39fe2720c84dfa0fe3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to PDF files on various domains, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and external links are indicative of techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://srinivasagroup.com/ci/userfiles/files/vurarefejal.pdf In PDF document text
    • https://globalcircle.club/userfiles/file/24660967692.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/zasutojadozepek.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/81800683933.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/zulonatel.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/fozedurifulib.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/86225799283.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/30496367345.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/320176487.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///91875071678.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/dagerizisosewudabosegap.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161480fc9ed1cc---puvise.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/25354055691.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/xafolovevu.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/45339525037.pdfIn PDF document text
    • https://bataretak.com/img/files/file/xufakuwukaruzawekug.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/pariledemupazogukes.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96251590553.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/61146809754.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/tamazuxolunevibebimenoz.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/vefisejiw.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/62246764344.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=pubg+mobile+lite+apk+download+2021+new+updatePDF 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_off0000c08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC08F 19460 bytes
SHA-256: ea664d837ff249e3775d09488e8445b041ef90087943d94e67bb12fe3e8c8a66
font_01_sfnt_off0000f3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD0 11180 bytes
SHA-256: 89cffc9b81407d079b57d23e134b9aa0a4afa6ee5b53e9994eee3ccaee382339

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