Malicious PDF — malware analysis report

Static analysis result for SHA-256 20857aa6227f3201…

MALICIOUS

PDF

77.0 KB Created: 2021-03-14 07:47:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b252804549612e27f155e53f96e93218 SHA-1: dae21522bf88e41e64d094e1c6b2150264ca0fc9 SHA-256: 20857aa6227f32012901587e5f8f4d9120edd360db59c92990ca040e5bd020b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to PDF files hosted on services like Weebly and CDN-CMS, suggesting a link farm or redirection mechanism. The embedded content, though heavily obfuscated, indicates an attempt to masquerade as a file manager download, likely to trick users into visiting malicious sites or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/123?utm_term=root+browser+file+manager+apkpure
    • https://mosezusimoz.weebly.com/uploads/1/3/1/6/131637881/ronobexawenemime.pdf
    • https://niwifexugebap.weebly.com/uploads/1/3/5/3/135316215/1854309.pdf
    • https://cdn.sqhk.co/nebuneduzib/R5FrV56/36713265341.pdf
    • https://cdn-cms.f-static.net/uploads/4454822/normal_5fd77d5f96f34.pdf
    • https://cdn-cms.f-static.net/uploads/4365602/normal_6022e7d5cf613.pdf
    • https://cdn-cms.f-static.net/uploads/4414358/normal_60321eba28504.pdf
    • https://sefedajexoxoj.weebly.com/uploads/1/3/4/4/134479396/2186422.pdf
    • https://cdn.sqhk.co/wakivugex/bgdheZV/62745144545.pdf
    • https://cdn-cms.f-static.net/uploads/4368971/normal_60287e0c23e58.pdf
    • https://static.s123-cdn-static.com/uploads/4449424/normal_5ff23ff427663.pdf
    • https://lefazevi.weebly.com/uploads/1/3/0/8/130873710/b15bb1acf29b04e.pdf
    • https://static.s123-cdn-static.com/uploads/4447271/normal_5ff77273d818d.pdf
    • http://bulakirip.getenjoyment.net/3d_printing_technology_download.pdf
    • https://static.s123-cdn-static.com/uploads/4451756/normal_5ff486e2a772e.pdf
    • http://bumasujofoj.getenjoyment.net/zabojefajolivuratepadom.pdf
    • https://podinelejuwe.weebly.com/uploads/1/3/2/7/132710627/podivenexob.pdf
    • https://cdn-cms.f-static.net/uploads/4366406/normal_601a32aedaebc.pdf
    • https://static.s123-cdn-static.com/uploads/4383475/normal_5fe2fc502731c.pdf
    • https://cdn.sqhk.co/madagijoj/1gdhhY1/star_fashion_designer_app.pdf
    • https://defavelusanopef.weebly.com/uploads/1/3/5/3/135345674/dezelaroxep.pdf
    • https://cdn.sqhk.co/vorebilifi/qmhilg2/paditebebok.pdf
    • https://kekulepolunan.weebly.com/uploads/1/3/4/8/134889268/miteviko_bidow.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d59f.bin
69ce897d895691e63ac31d205e1da918122540f3cc30822c676ff50db9a9ac3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD59F 5524 bytes
font_01_sfnt_off0000e86b.bin
7487ac8a88e79529e5e8610be9e8cb53ec75b4ef4b15f2e650850c5c10d68ce7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE86B 11092 bytes
font_02_sfnt_off00010e82.bin
56959c003ad1cc882eb7b87bd2b1b9c61dd4ba2d4f0695f95b1433f05071c63d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E82 16340 bytes

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