Malicious PDF — malware analysis report

Static analysis result for SHA-256 6741388ce5e2207c…

MALICIOUS

PDF

46.9 KB Authoring application: Mobipocket Creator
MD5: 2b28eb826f92aca355368ad384de4047 SHA-1: 02d065c2b460f5e9ea830dc3297ce460d7f7563f SHA-256: 6741388ce5e2207c630fcad6c4b63083d104587406b577a03391967a1ecea7a7
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to external PDF files, as indicated by the PDF_SEO_LINK_FARM heuristic. The ClamAV detection and ML classifier also flag this file as malicious, specifically as a phishing attempt. The embedded URLs are the primary IOCs, suggesting a campaign to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ter.123game.pro/uploads/2020/01/28/vewusikikibixer-gefadoletejevo.pdf
    • http://shoptrueblessings.com/uploads/1/3/0/5/130588653/kugifenuw.pdf
    • http://wegezanu.trainer-best.info/uploads/2020/01/29/sajefulifawotogudivi.pdf
    • http://zambiasafarihunting.com/uploads/1/3/0/2/130270808/130270808.html#barron%27+s+sat+prep+29th+edition+pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001037.bin
632d3fee3c1f2bc136b6ffbbd2e6988022bc2992f6377d2092e107745df4f7ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1037 8904 bytes
font_01_sfnt_off000070ee.bin
5d7ebd720715cd86529581f1d40cc643f68465477bd430d4be5ff736bc95f798		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70EE 16268 bytes

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