Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ebc6461454d218…

MALICIOUS

PDF

50.7 KB Authoring application: LibreOffice
MD5: 01336bc2a4212ef471ca973780353cc1 SHA-1: 915f7cc522d70a465092fdff432305a9f72dfda4 SHA-256: 81ebc6461454d218ea6f68f9db278bd900a2b55f39a40985395b78b929a9b23f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, each hosting a PDF file with a numeric or slug-based filename. This pattern suggests the document is part of a link farm or SEO manipulation scheme, potentially to distribute malicious content or improve search rankings for malicious sites. The ClamAV detection and ML classifier further support its malicious nature.

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://aakphotos.net/uploads/1/3/0/9/130969710/tukadipabobe.pdf
    • http://changeandbechanged.org/uploads/1/3/0/6/130621734/tapurufu-golur-juror-nexuzor.pdf
    • http://lmylife.net/uploads/1/3/0/6/130621044/nojulimaw_xipas_lakebexituzobog_xufivediben.pdf
    • http://mitacoponchos.com/uploads/1/3/0/7/130775031/zatotularo.pdf
    • http://swapooexchange.net/uploads/1/3/0/7/130740533/gakaxatulumavupogek.pdf
    • http://mikebouchard.net/uploads/1/3/0/2/130291699/2189909.pdf
    • http://nomadicescaperoom.com/uploads/1/3/0/6/130605175/jabowapulifu.pdf
    • http://rebornanimalrefuge.com/uploads/1/3/0/8/130813539/7539556.pdf
    • http://www.mirror2rorrim.com/uploads/1/3/0/6/130620207/1557587.pdf
    • http://medezen.net/uploads/1/3/0/5/130588286/jikegumiv_luzikamolikaje.pdf
    • http://xinshijiyulechengzenmejinbuqu.br3h.com/uploads/1/3/0/2/130288802/130288802.html#biosynthesis+of+flavonoids+acetate+pathway+and+shikimic+acid+pathway
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.adobe.com/).Noto
    • http://www.google.com/get/noto/http://www.adobe.com/type/This
    • http://scripts.sil.org/OFLNoto
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000511b.bin
7c0940fac49c052d28ff16c680f263f23e60b57081d744924df3aa3fe63b27e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x511B 4756 bytes
font_01_sfnt_off00005fa5.bin
4d9ec2aec8f1ca6bebe1b56492fd55a77bba3a6e98efb76508c1b835d4eb9912		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FA5 2860 bytes
font_02_sfnt_off00006cd4.bin
af2408e81c707ef5ed0589ece6d825a98d4e3b317fa8c8c80567dc3aa487b3e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CD4 9708 bytes

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