Malicious PDF — malware analysis report

Static analysis result for SHA-256 45136bdd5ed6314c…

MALICIOUS

PDF

37.0 KB Created: 2020-06-01 11:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be576db0e989ab16cace0bb72376c4d5 SHA-1: 75490a15592ffc88a2cbb3e60fa0e7d0cc9bf329 SHA-256: 45136bdd5ed6314cdc5f8160175771c8f0ddb030c7c9ef3090581e0ad3873b30
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The document body, though heavily obfuscated, contains text related to 'English reading books' and includes URLs that point to similarly structured domains. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent. The primary attack pattern involves luring users through deceptive content to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://mta-sts.mail.murphonanadventure.com/uploads/1/3/0/4/130436337/130436337.html#ingilizce+okuma+kitaplar%25C4%25B1+level+1+pdf
    • http://lafestivals.org/uploads/1/3/0/9/130969236/9367936.pdf
    • http://bicdiamonds.com/uploads/1/3/0/6/130605339/mesezunedo-wukizeb-bogevelasifix.pdf
    • http://leftoverbuildingsupply.com/uploads/1/3/1/8/131857920/1493879.pdf
    • http://onemanspath.com/uploads/1/3/1/0/131070590/c97f44ac6b.pdf
    • http://cryptopreceptor.com/uploads/1/3/1/3/131382018/kotabalu-notosif.pdf
    • http://grillhousebrand.com/uploads/1/3/1/4/131407876/kugerurituriwu-konesifelox.pdf
    • https://jadulotixen.files.wordpress.com/2020/05/lezenipuvem.pdf
    • https://wafadonob.files.wordpress.com/2020/05/67153670107.pdf
    • https://robepeler.files.wordpress.com/2020/05/sifewodezibudawu.pdf
    • https://zeraperusute.files.wordpress.com/2020/05/81363197242.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b6d.bin
8c0676922e0622ac631c1c83e96d09c85c4b46000b4898f0d97010804f0f56d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B6D 14460 bytes

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