Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7df3b82f3363d5f…

MALICIOUS

PDF

94.3 KB Authoring application: Smallpdf Desktop
MD5: e1f1d17b218a0babe4d92dd5922eb414 SHA-1: aff30ae478ecc11277886627de2147a2cdf69614 SHA-256: d7df3b82f3363d5fe1579364b5633bfda0a4ff171f7a11b431c0a437f048ebde
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical alert for a large number of external PDF links, indicating a link farm. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing or traffic-generating PDF. The document body contains numerous URLs pointing to PDF files hosted on various domains, suggesting a campaign to drive traffic or distribute malicious content through these links.

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://thingstodoambercove.com/uploads/1/3/0/4/130435902/fisad_soxiku.pdf
    • http://nsuxa.net/uploads/2020/01/27/b0600.pdf
    • http://nolamadef.vipiski-online8.icu/uploads/2020/01/28/gotumapetukudaxo.pdf
    • http://cathyhepworth.com/uploads/1/3/0/5/130589313/zeminudenenolaref.pdf
    • http://8760athletics.fit/uploads/1/3/0/6/130621330/pubekige.pdf
    • http://teachinggeographybusinesscommerceaustralia.com/uploads/1/3/0/4/130476573/3888169.pdf
    • http://sgdpress.com/uploads/1/3/0/4/130490378/nasegader.pdf
    • http://joni.girls23.pro/uploads/2020/01/28/vomiwop_nakizoduzakix.pdf
    • http://mpedotaclan.weebly.com/uploads/1/3/0/6/130621082/sabomumivodaj.pdf
    • http://tasurupate.xalat24.ru/uploads/2020/01/29/402a8.pdf
    • http://vinylatm4ud.com/uploads/1/3/0/6/130621702/mowaredomaju.pdf
    • http://gratisguidelanzarote.weebly.com/uploads/1/3/0/6/130621248/kalaju_jojewigipipawus_detevafu.pdf
    • http://siphc.net/uploads/1/3/0/6/130604147/nopirunuxa.pdf
    • http://witwtravel.com/uploads/1/3/0/6/130620916/bitozigudulizok_fawome_mufofika_wogigazibe.pdf
    • http://clean-cooling.org/uploads/1/3/0/6/130621374/130621374.html#aristotle%27+s+metaphysics+pdf

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000012fd.bin
fe9243626eb0829ef3ff4c6659ee53a5e741665fa619820249d0161411ef59ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD 8292 bytes
font_01_sfnt_off0000ab6d.bin
561064ce3700ea4d9ffcd2917595f4c53fc3fa74aa0a111772fa3db381b922e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB6D 3360 bytes

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