Malicious PDF — malware analysis report

Static analysis result for SHA-256 8585421f4b2e71fa…

MALICIOUS

PDF

72.1 KB Created: 2020-12-22 07:56:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01a91d08bcee1b5459eb36d63a758093 SHA-1: 62b9d6bf45c7970bd0ecef68e86a45c43ed703e5 SHA-256: 8585421f4b2e71faf329147da55f77fe9f0eff96a2c934b7b1b5b0cc2d2c02ca
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing and trojan delivery mechanism. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document's content is designed to trick users into installing software, a common precursor to malware infection or credential theft. The presence of numerous external links, including one to 'traffking.ru', suggests a link farm or redirection infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://traffking.ru/strik?utm_term=brightspace+pulse+application
    • https://static.s123-cdn-static.com/uploads/4495392/normal_5fc3c122dd66f.pdf
    • https://cdn-cms.f-static.net/uploads/4365582/normal_5f87219db74c4.pdf
    • https://felomavemupej.weebly.com/uploads/1/3/4/5/134583365/06be5240.pdf
    • https://static.s123-cdn-static.com/uploads/4471083/normal_5fd096a902a17.pdf
    • https://cdn-cms.f-static.net/uploads/4367961/normal_5f8778e925fcb.pdf
    • https://static.s123-cdn-static.com/uploads/4409417/normal_5fc76f10e041a.pdf
    • https://cdn-cms.f-static.net/uploads/4367959/normal_5fafdb8823bfb.pdf
    • https://dupagerenukuxat.weebly.com/uploads/1/3/4/7/134751723/vedafoxidaturipef.pdf
    • https://cdn-cms.f-static.net/uploads/4385217/normal_5fb714ae38089.pdf
    • https://cdn-cms.f-static.net/uploads/4391954/normal_5f9a859ff09b5.pdf
    • https://static.s123-cdn-static.com/uploads/4403410/normal_5fc45d4177d8c.pdf
    • https://cdn-cms.f-static.net/uploads/4490949/normal_5fd9b67fd15ba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc3051916f6d44b07cc8110/t/5fc85293e101942bf76cbdba/1606963860146/53219186167.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe0e9bfa04221c71e81cb6/1606291108568/pokeball_plus_black_friday.pdf
    • https://static1.squarespace.com/static/5fdec2aa0172f85bb32b3e9e/t/5fdf906c15a11837d0bd9aa6/1608487020619/82053156970.pdf
    • https://static1.squarespace.com/static/5fc6438fbdb33045eee6a409/t/5fd7078aacac596b0cd1a1ae/1607927690714/free_simple_gantt_chart_excel_template_xls.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de90.bin
c4234459e9ce945a620a5d12253dc7146d617eb649051d747c288c06b1d3a396		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE90 5244 bytes
font_01_sfnt_off0000f064.bin
b5d86a4db300a49a32671c7c77c25291a4c82e2c96e884f3715684fc9c8967a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF064 10332 bytes

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