Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c269409637a3c3…

MALICIOUS

PDF

37.3 KB Authoring application: LibreOffice
MD5: b1e913415d0997ad61614fab406eaca3 SHA-1: b0de7e1482607afd6ef41650b575e7dab56a03c1 SHA-256: f4c269409637a3c3db1658a5d551922e7a5eb47c50be9964523e6e49c458ec57
150 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. The ClamAV detection as 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the ML classifier's high confidence score further support a malicious classification. The document body, though containing garbled text, also includes several of these URLs, reinforcing the attack pattern of redirecting users to external content.

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://sryoga.co.uk/uploads/1/3/0/2/130287289/wimutizumak-nojiwufozugu-xirelivadomo.pdf
    • https://pixadupiduwata.weebly.com/uploads/1/3/0/4/130476396/7b2203433.pdf
    • http://newceo.hplct.org/uploads/1/3/0/2/130288320/8742232.pdf
    • http://rambow145.com/uploads/1/3/0/6/130639765/gotufe.pdf
    • http://accidentallymj.weebly.com/uploads/1/3/0/3/130313243/6753655.pdf
    • http://beatdiabetesnow.org/uploads/1/3/0/6/130620951/pediliguguvu.pdf
    • http://nowphotobooths.com/uploads/1/3/0/5/130550986/razezepasige.pdf
    • http://bernardobellostudio.com/uploads/1/3/0/6/130620985/130620985.html#final+fantasy+brave+exvius+gilgamesh+trial+guide

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000011de.bin
6c1f2339b04de028e94e61b99417bb042aa7ff57b68519b42fc79e2316d7cfbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE 9012 bytes

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