Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ab986dee2217e9…

MALICIOUS

PDF

39.9 KB Authoring application: LibreOffice Draw First seen: 2020-12-25
MD5: 52fe69a6080a41cda2db7fde8c561a18 SHA-1: 388aed219e3558efa9e5e499150790b7d318ebc0 SHA-256: 91ab986dee2217e9cbd945d0f1aca7b67be15fc2cde75de7b7356fb200c75038
152 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various websites. The document body, though heavily obfuscated, contains references to 'ebooks' and a specific title, suggesting a lure to download content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 3

  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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.
  • 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://caagroupllc.net/uploads/1/3/0/5/130547812/9831097.pdf In PDF document text
    • http://palochkin.fun/uploads/2020/01/28/zarat.pdfIn PDF document text
    • http://theaccountantthatlovestech.com/uploads/1/3/0/4/130483319/a08f33646dd0.pdfIn PDF document text
    • http://davidmarquesibanez.com/uploads/1/3/0/6/130621954/130621954.html#marketing+the+core+7th+edition+pdf+fIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00000fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC 8808 bytes
SHA-256: 57937b2984992bb63f51265b4bf023e0d49e66952be85e446fd77633c7f2d57b
font_01_sfnt_off00004c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C43 16520 bytes
SHA-256: 96ee072de95bf0b347a036769b4ca45ebfe4268dffb93e02b77991f7ec307c14
font_02_sfnt_off000061d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61D6 1708 bytes
SHA-256: 83459e82cebe561b9e65dda6a09953c9e35f75e5df0fa62a624e1833cc5b8086

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