Malicious PDF — malware analysis report

Static analysis result for SHA-256 52eb17a938d461c9…

MALICIOUS

PDF

40.6 KB Authoring application: GIMP
MD5: 00839c0aa3a457f8f1e136fb8dac34d6 SHA-1: 65e2c5bac4bca945a98d4a6ab4cbf6e0092326c6 SHA-256: 52eb17a938d461c95a947df2542d82206145e7e28754d881cd1d97e9cbaced15
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though partially corrupted, mentions 'Antimicrobial resistance a manual for developing national action plans', suggesting a lure to disguise the malicious nature of the embedded links. The primary attack pattern involves redirecting users to a network of potentially malicious websites.

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://mkebookscoach.com/uploads/1/3/0/4/130488506/jaxijax.pdf
    • http://kellenkellenkellen.com/uploads/1/3/0/4/130478123/2126722.pdf
    • http://cakzglamdepo.com/uploads/1/3/0/5/130590403/a53e1b29a.pdf
    • http://crablefoundation.org/uploads/1/3/0/6/130604820/e959ee5207.pdf
    • http://calgarypopupweddings.com/uploads/1/3/0/6/130605406/130605406.html#antimicrobial+resistance+a+manual+for+developing+national+action+plans

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000100e.bin
5c6538745fd2857171611afb7a8f28f7286c0c530d1349cf60a95b834de6d05a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100E 7728 bytes
font_01_sfnt_off000058a4.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58A4 16036 bytes

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