Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e118e0dac958497…

MALICIOUS

PDF

83.6 KB Created: 2021-09-23 20:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 59d4f121d85782531411df4c16077230 SHA-1: cfa5db0455f79151aea9e535cd60cedef66e8b8f SHA-256: 5e118e0dac958497851edfdbf19428f43358b91f06e97ce205769551b1c7c797
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a heuristic specifically identifying it as a 'link farm on disposable hosting'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://bcslaw.hu/admin/fck_upload/file/kowevujef.pdf In PDF document text
    • https://hyundainhapkhau.vn/upload/files/57600294986.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/sogovapuwolojewexeroja.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/vebavaludibapopeje.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/89643481428.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/wometodedodetiji.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/87268930159.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/difuropur.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/48287897483.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/37914845536.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/93481020178.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/gubobarupigarox.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/mulafu.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/161483e3e760f9---xewiwilufukudu.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/34573238552.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613698132b5af---pazatovavolago.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/65288009387.pdfIn PDF document text
    • http://riph.pl/userfiles/file/doval.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/wanuzakapizes.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/tirajasenosofelu.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/91976639973.pdfIn PDF document text
    • https://okazionche.com/files/wazuduzamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=elon+musk+book+pdfPDF 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_off0000dfce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E5 10392 bytes
SHA-256: 79b9ce84f1a81948d54fb86fe86b305cdfa55e4bfbf3e75fd4a2d5093607646d
font_02_sfnt_off00010f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F15 19064 bytes
SHA-256: 078dd65df464002e22e30f7948d9b6ba7c9f149101db34b947b1ab54a469472b

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