Malicious PDF — malware analysis report

Static analysis result for SHA-256 964e43db461e0150…

MALICIOUS

PDF

53.1 KB Authoring application: Nitro PDF
MD5: 48a6975562ea7bfe0b77dabb5139dacd SHA-1: 7712a107684efc6b56e02be16161068ef9e4fd73 SHA-256: 964e43db461e0150b262ac9a2eebf6793e6fb1a44b7c3b1c14c7713d2d62787b
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, suggests a pretext of a 'Letter of recommendation from employer for masters degree pdf'. This combination strongly suggests a phishing or malware distribution attempt, leveraging the embedded links to redirect the user. The ClamAV detection further confirms its malicious nature.

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://pcfuganda.org/uploads/1/3/0/4/130483772/01796b.pdf
    • http://authorconversations.com/uploads/1/3/0/3/130313218/toluvibiweb.pdf
    • http://palliativecareforuganda.com/uploads/1/3/0/5/130541465/domarov_zeniruvifez_fubopoxavenem_zuzer.pdf
    • http://minnesotakindnessproject.org/uploads/1/3/0/5/130543653/45e65fadb7bb.pdf
    • http://mysunnysummer.com/uploads/1/3/0/6/130603887/02843a9662.pdf
    • http://bifazo.spoiler.su/uploads/2020/01/29/zotezupubewimaj-weloxovazezuna-xifokof-pavapuvad.pdf
    • http://shakti-circus.com/uploads/1/3/0/2/130272384/fe8abdccaaa8.pdf
    • http://arcadiagardensllclandscapinganddesign.com/uploads/1/3/0/5/130551271/130551271.html#letter+of+recommendation+from+employer+for+masters+degree+pdf

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000011eb.bin
53c82a75429583beeb3260cb63a098a4ee4a55614df129c008c8a953ea230657		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB 8304 bytes
font_01_sfnt_off00008a79.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A79 16036 bytes

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