Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ac71187306c4483…

MALICIOUS

PDF

41.7 KB Authoring application: Pdftk
MD5: a49645619f8ed539cfbac9c7f5813ffd SHA-1: ca760a17fe8092afb92597c5b2b6014462d901f5 SHA-256: 9ac71187306c4483f216e8d6e0643c9d0b2db64e831a31e762df9ca9d4cc28c0
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links to external PDF documents hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content, as flagged by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV also strongly indicate maliciousness. No scripts were extracted, but the sheer volume of outbound links suggests a phishing or SEO-based malicious distribution 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://allesaker.com/uploads/1/3/0/4/130436125/4382974.pdf
    • http://vanessanysten.com/uploads/1/3/0/3/130379070/luzafomifafopuraxab.pdf
    • http://513freemusic.com/uploads/1/3/0/5/130543671/defibavuturotadox.pdf
    • http://carmarelpaso.net/uploads/1/3/0/4/130483318/vekiruwavaj.pdf
    • http://montessori-lomas.com/uploads/1/3/0/6/130621989/4883727.pdf
    • http://sur.kavkaz-car.ru/uploads/2020/01/28/razijaxas.pdf
    • http://watsontesting.weebly.com/uploads/1/3/0/6/130621684/47c07cc2.pdf
    • http://lacollectiva.org/uploads/1/3/0/3/130379094/88544910b8.pdf
    • http://voreckapp.com/uploads/1/3/0/2/130288310/fakokivujasosimebaz.pdf
    • http://studio10saloncolorspa.com/uploads/1/3/0/6/130621983/8621460.pdf
    • http://nuobeijinghotel-chinese.devsite-1.com/uploads/1/3/0/2/130270849/130270849.html#icloud+email+login+android

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001214.bin
11000c22cc77095b53d4d660fd527bb007e9d39c3f6691374a914988345b66b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1214 8236 bytes

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