Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b2fdde35cac87b…

MALICIOUS

PDF

40.6 KB Authoring application: Poppler-utils
MD5: 70bfb7bd7ccb997e704076787bd6e97e SHA-1: c825ede83d8c46abea23d2d8b93538eadb1d7b4b SHA-256: 09b2fdde35cac87b9acea2ff95c0385307213382005dcff32461de7b4fc240f5
152 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, and it contains a significant number of embedded links to external PDF files. The heuristic 'PDF_SEO_LINK_FARM' indicates these links are likely part of a scheme to generate traffic or distribute further malicious content. While no scripts were explicitly extracted, the nature of the embedded links suggests a phishing or malware distribution vector.

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.
  • 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://vorelisuw.audiostart63.icu/uploads/2020/01/29/puzunedasarojumow.pdf
    • http://leaderaccount.ru/uploads/2020/01/29/e29f099de.pdf
    • https://judifasa.weebly.com/uploads/1/3/0/3/130313127/9809119.pdf
    • http://numakav.homecookingbook.com/uploads/2020/01/27/3874740.pdf
    • http://vaponakum.svobodafond.ru/uploads/2020/01/27/wodiduwulow.pdf
    • http://rijaga.galaxytools.ru/uploads/2020/01/28/8017646.pdf
    • http://kewa.fun/uploads/2020/01/28/b81d8bea.pdf
    • http://oakclass.com/uploads/1/3/0/5/130546759/130546759.html#espn+body+issue+2009

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000011b2.bin
3640f75599b1057c43b4486d63cf5dc1095d62a3c04b2bbdc932b1f8493d2527		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2 9768 bytes

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