Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad25c9e7cad5151b…

MALICIOUS

PDF

44.1 KB Authoring application: Poppler-utils
MD5: e053089aa917bf362bd4783b460f3b91 SHA-1: c8b72368e5a9fa164ea456dac5b7713becc181e2 SHA-256: ad25c9e7cad5151b0602be2287768e5f977b692823edf08c8261037850b1d68d
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing a large number of external links, specifically a 'link farm'. The ClamAV detection 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the ML classifier output strongly indicate malicious intent. The embedded URLs point to various PDF and HTML files hosted on different domains, suggesting a coordinated effort to distribute malicious content or manipulate search engine results.

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://eliteculinarychef.com/uploads/1/3/0/3/130379463/9561614.pdf
    • http://simplinowtribe.club/uploads/1/3/0/6/130639123/4960875.pdf
    • http://gut.trasir.ru/uploads/2020/01/28/dikixerosaxafimeker.pdf
    • http://jerremyholland.net/uploads/1/3/0/5/130589252/2464932.pdf
    • http://countrymuttmaine.com/uploads/1/3/0/2/130272084/4427162.pdf
    • http://200jobs.com/uploads/1/3/0/5/130545097/fozuzizaxezofokakive.pdf
    • http://allergy.mediutopia.com/uploads/1/3/0/6/130621212/130621212.html#singapore+island+country+club+annual+report

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001156.bin
996b4914e9245f9a410dda61dc48c91e484e8d86935fa5d5b41dd809ab668d7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1156 8976 bytes
font_01_sfnt_off0000668a.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x668A 16036 bytes

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