Malicious PDF — malware analysis report

Static analysis result for SHA-256 6507ea4985e331de…

MALICIOUS

PDF

83.0 KB Authoring application: Mobipocket Creator
MD5: 9fa155f108d1d107a21a3fa5958df7ff SHA-1: 0f00356b5412002761d8095db6ba954ba7790bbf SHA-256: 6507ea4985e331defe993cc1e6f34a3541e714df0453e79050fca66df06be708
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits a critical heuristic for a PDF link farm. The document body contains numerous URLs pointing to external PDF files, suggesting a tactic to distribute content or manipulate search engine results. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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.
  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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://takadiwowo.wisdom-olga.ru/uploads/2020/01/28/kovadijopufirapadip.pdf
    • http://saeart.com/uploads/1/3/0/2/130287401/64a75.pdf
    • http://donnezonline.com/uploads/1/3/0/5/130542875/2111287.pdf
    • http://myfinlandlimerence.com/uploads/1/3/0/2/130270934/4442008.pdf
    • https://liwawakax.weebly.com/uploads/1/3/0/4/130483489/1293696.pdf
    • http://aspiretogetherforum.org/uploads/1/3/0/4/130489262/5757054.pdf
    • http://juzu.vipiski-online8.icu/uploads/2020/01/29/rusaj.pdf
    • http://beingself-centered.com/uploads/1/3/0/6/130620928/130620928.html#allosteric+enzyme+inhibition+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001248.bin
4613cd25affb166a18947fd0ffab675cb17ea7f54f99327c6510e51ee13c003a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1248 9080 bytes
font_01_sfnt_off0000686b.bin
1b8c009221b05b1603485970121ef3ec5ce392a82ba7c4b82e6d63029394a6b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x686B 16296 bytes
font_02_sfnt_off00007de6.bin
21794f3f4082434ff9f17cb6ca0eede1938ec4454fe7e24196b08c922f15092f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DE6 3448 bytes

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