Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f1333ac5bc55c3f…

MALICIOUS

PDF

52.4 KB Authoring application: Poppler-utils
MD5: 4b610d274e6e42ce402a98037169a2fc SHA-1: fac73633c3ec5676d800ffce16c44ce54d2d6f63 SHA-256: 6f1333ac5bc55c3f8a0f9354af5c95e88826e2b9bb47bd1e0503d6f1ad7966ab
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The critical PDF_SEO_LINK_FARM heuristic fired, revealing a large number of embedded external links to other PDF files, suggesting a link farm or distribution mechanism. While no scripts were explicitly extracted, the presence of numerous URLs points towards a phishing or content distribution attack. The document body contains garbled text and URLs, further supporting the 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://mhlarue.com/uploads/1/3/0/5/130588430/4661431.pdf
    • http://competitivekarting.com/uploads/1/3/0/6/130620382/c12c20844dde34.pdf
    • http://ndtaxaide.weebly.com/uploads/1/3/0/5/130544063/nifolemupiw.pdf
    • http://arkansasartpottery.com/uploads/1/3/0/4/130436108/jesajupiv.pdf
    • http://freespiritgirl.com/uploads/1/3/0/4/130483587/valejimopovib.pdf
    • http://legacyunit.pink/uploads/1/3/0/6/130620979/dexipefase-genefodoxige.pdf
    • http://the-city-exchange.com/uploads/1/3/0/5/130540134/9cd5a08.pdf
    • http://nctopografia.pt/uploads/1/3/0/2/130287401/mofiriwurifej-doxuli-nanixijoropor.pdf
    • http://larisahinojosa.com/uploads/1/3/0/5/130551055/5970271.pdf
    • http://timberlinemedicalconsulting.com/uploads/1/3/0/5/130588492/dab95d7e3bb3.pdf
    • http://assric.org/uploads/1/3/0/4/130436272/5551277.pdf
    • http://reboundat.com/uploads/1/3/0/7/130738940/130738940.html#terapia+sebastian+fitzek+descargar+p
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000156b.bin
e9786b2e5905507a2ad1f1bcaa3aa29752109c77ccee1524448d9c488f363caf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x156B 10364 bytes
font_01_sfnt_off0000762b.bin
e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x762B 2652 bytes
font_02_sfnt_off00007fa0.bin
1357a11f707fb834cac759a1a6c24a91b396f0df3c72968141f7b8e8a1b069ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FA0 18104 bytes

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