Malicious PDF — malware analysis report

Static analysis result for SHA-256 630f8c585849421f…

MALICIOUS

PDF

86.1 KB Created: 2021-09-15 20:37:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0b2396fa46c0862f93e317833d068cc0 SHA-1: ca538ad819d712c53df75af34a48a6ee83b5aaab SHA-256: 630f8c585849421fde6384a8ab566007ff19ddd6b9cff4ba316fcccde18dd08d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users through a network of potentially compromised or disposable sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://vyveva.eu/UserFiles/File/56822062215.pdf In PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/bosopikimuritoge.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/89948387615.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/welutuledebopu.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/1n2t3lmkoo89bo07ggm8c7rm36/luruxe.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/gupuso.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140388c53cfe---96881191709.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/70086012810.pdfIn PDF document text
    • http://idroter.org/userfiles/files/pegoj.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/64688900923.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/41017543000.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/gapizefizagegelom.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/24458927832.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/91535736821.pdfIn PDF document text
    • https://chineseclothingonline.com/File/17029490846.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/5165747185.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/bifiposixutipupomeragudox.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/gufebiri.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/21448367172.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/70096566137.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/nopuz.pdfIn PDF document text
    • http://delve-cr.com/uploads/gisede.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/89267247793.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=next+friday+datePDF 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_off0000ec74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC74 10104 bytes
SHA-256: c05374d6f99fa8aabda4c2359e8802b979c626b3d044361778c246a168378a24
font_01_sfnt_off00010322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10322 18376 bytes
SHA-256: a7535ae3ca423008824a8aaf8af5a4cd3d456edfeb340c591a7cc45907bcc69a
font_02_sfnt_off00013332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13332 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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