Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1559b1eef7dc49…

MALICIOUS

PDF

39.1 KB Authoring application: Pdftk
MD5: 384d8df41507adfaea2a0df0b6c2ac6c SHA-1: d6b66990f29b7e44e4279425b57f279581abc53f SHA-256: bc1559b1eef7dc49fec6a0b80fa67250fb16a7cfcaea36068fcd0e7ac26447fe
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links to external PDF files, a technique commonly used for SEO poisoning or to redirect users to malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body, though partially corrupted, mentions 'Advantages of artificial intelligence in accounting pdf', suggesting a lure to entice users to click the 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://gaass.net/uploads/1/3/0/7/130775679/sujifevu_xisoxixigazub.pdf
    • http://www.red-sup.com/uploads/1/3/0/6/130640060/figijisaseruxafi.pdf
    • http://slatteneyecare.com/uploads/1/3/0/6/130639998/dodebole.pdf
    • http://accesseuropetour.com/uploads/1/3/0/7/130740211/nijuvufeja.pdf
    • http://mon.peacesupportfund.org/uploads/1/3/0/4/130491008/f2d7cb2.pdf
    • http://www.sheisredeemed.net/uploads/1/3/0/6/130604879/6049886.pdf
    • http://mrnicecream.us/uploads/1/3/0/5/130541116/1490266.pdf
    • http://piotec.org/uploads/1/3/0/7/130739619/8221214.pdf
    • http://glasgowchinese.org/uploads/1/3/0/4/130436054/3332380.pdf
    • http://asenamott.com/uploads/1/3/0/2/130272945/kipijolufuj.pdf
    • http://vn55.brdge.org/uploads/1/3/0/4/130476413/130476413.html#advantages+of+artificial+intelligence+in+accounting+pdf

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004341.bin
4c4bbe41c4c825c6c6ce7f390dfa467af466b9cd176b35fca6a3eab20307ce63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4341 7888 bytes

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