Malicious PDF — malware analysis report

Static analysis result for SHA-256 6621b512c5bba4b0…

MALICIOUS

PDF

32.6 KB Authoring application: LibreOffice
MD5: af90494c9ff8ef3e4cd7cd0691a241d8 SHA-1: 00eb70546628b02f8c6d4a10afdf8407bf960a57 SHA-256: 6621b512c5bba4b03b5914d75c73d280374e5d2b91c12cf6988d34c5b853dd77
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs pointing to external PDF files across 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 detection further support its malicious nature. No scripts were extracted, and the document body content is heavily corrupted.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.xalimadsgn.com/uploads/1/3/0/2/130271038/ec6a821.pdf
    • http://myclotheslineapp.com/uploads/1/3/0/3/130313746/wemavobef-senelolid.pdf
    • http://scarletcarnival.com/uploads/1/3/0/6/130605289/73b739d.pdf
    • http://adentamalaysia.com/uploads/1/3/0/5/130588635/6861997.pdf
    • http://privacyprerogative.com/uploads/1/3/0/6/130604475/cbc054e89413d.pdf
    • http://nevadachallenger.net/uploads/1/3/0/7/130739196/62ce1fc8c768.pdf
    • http://pitparts.net/uploads/1/3/0/4/130493816/gusonugisune-vokenoxomipan-kitafezeribiw.pdf
    • http://pittybullystaffyaddicts.com/uploads/1/3/0/7/130740264/62a3876.pdf
    • http://mikescottthomson.com/uploads/1/3/0/5/130543488/lipojozufeb.pdf
    • http://royalinstincts.com/uploads/1/3/0/6/130620678/lexetik_sokamexiwaroj.pdf
    • http://mirembegirlsvocationalcentre.com/uploads/1/3/0/4/130488974/lefitotupusidarejot.pdf
    • http://nadzorinwestorski-gliwice.pl/uploads/1/3/0/4/130436451/2416542.pdf
    • http://host72.carmichaelnl.com/uploads/1/3/0/3/130313470/130313470.html#past+simple+and+present+perfect+contrast+exercises+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001cc6.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC6 2652 bytes
font_01_sfnt_off00002853.bin
b82debe79c4cc87c74f651318c79fddc88a0f093e27a3178eee4229a4ea12748		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2853 7216 bytes

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