Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b368cf5c55e8d65…

MALICIOUS

PDF

41.7 KB Authoring application: Pdftk
MD5: 3bda7fb33aa6676180b296256580860c SHA-1: e563e645d1e40408fb7484d33bac5e94cc810803 SHA-256: 0b368cf5c55e8d6506e40c9812e10a73b06d31b71c1e831c00d7d64f7eb95d14
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV also flagged this file as malicious, with ClamAV identifying it as Pdf.Phishing.TtraffRobotInstall. The document body, though heavily obfuscated, contains references to IELTS writing samples and includes numerous URLs that are likely part of a link farm or phishing campaign.

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://oakdellfarm.com/uploads/1/3/0/6/130621359/7374316.pdf
    • http://noonsknives.com/uploads/1/3/0/3/130323602/d64cf0d408b408b.pdf
    • http://conservamelia.com/uploads/1/3/0/6/130640182/9df75d7b0a31c3.pdf
    • http://fcaky.com/uploads/1/3/0/4/130483305/5510581.pdf
    • http://australiandiamondssports.com/uploads/1/3/0/4/130436494/fe0ccb1183bf511.pdf
    • http://wiwikiz.philmi.ru/uploads/2020/01/28/9602336.pdf
    • http://oiseauchic.com/uploads/1/3/0/6/130621523/nujuneloru-talugufobesolir-fizuzuguxako-damegonibaza.pdf
    • http://pjclakes.com/uploads/1/3/0/6/130620173/vumedazibin.pdf
    • http://multistreams.com/uploads/1/3/0/8/130814241/130814241.html#ielts+general+training+writing+band+8+samples
    • 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_off000011cb.bin
cd60bb8028c5bb2bb557f25cf393a2b59c2727263db003a5c2bf71fca8e90d85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB 8268 bytes
font_01_sfnt_off00005ccc.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CCC 16036 bytes

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