Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c1fecf05b718a6…

MALICIOUS

PDF

78.7 KB Created: 2021-09-12 05:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 166a984556f92d4092070a0ccfe1109e SHA-1: 2bdafb429ed6164f5c8c8a4802043cd6c1a0b409 SHA-256: a4c1fecf05b718a68dcac3e7196ee18bd962e8f9441044d419b7cc675ca68f0d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to distribute links from disposable hosting. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://zbirozskepodzamci.cz/userfiles/32035354785.pdf In PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/povob.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/78583483138.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/49028806622.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/tejujinemuxavevudop.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/77839894905.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/85550713641.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/38102507330.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/28484571215.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/46364142115.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/26676371890.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/11405181650.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/likudexoxiwonelopiximus.pdfIn PDF document text
    • https://fcimoveis.com/imgs/file/mepobunanivagaxamibuzobo.pdfIn PDF document text
    • http://inica.org/files/file///92610812744.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/pudimawogavedevunubogakav.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/51831063103.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/sazesuresotupekurubil.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/pupesufuluj.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dujotevogugamotaduxarabe.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/vagid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=open+sim+toolkitPDF 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_off0000d25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA71 10268 bytes
SHA-256: c91dfd267ca1ee63d33331bb78cfd2f445c28e546fc8496ade8dbbf025563205
font_02_sfnt_off00010187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10187 17096 bytes
SHA-256: e143e9ab8a55c83f0fc74147fcedc316ac854319f41dc0b048764f269a722843

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