Malicious PDF — malware analysis report

Static analysis result for SHA-256 836f639fc8fb8e76…

MALICIOUS

PDF

51.5 KB Authoring application: OpenOffice.org
MD5: cb9587a2b8840516ad36b9f49b9033f7 SHA-1: 85809efa8cbf5515a5dc5b1337daaf699eafcfe1 SHA-256: 836f639fc8fb8e760bb6dea2847e679b5ac93c310d754093392148576befe1c4
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, pointing to various PDF files on different domains. This suggests a tactic to manipulate search engine results or distribute additional malicious content. The ClamAV detection as Pdf.Phishing.TtraffRobotInstall-7605656-0 further supports a malicious classification. While no scripts were explicitly extracted, the structure and embedded URLs indicate a likely intent to redirect users to potentially harmful 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://craigheadcounty4hrabbitclub.com/uploads/1/3/0/4/130483413/851ca.pdf
    • http://link2yoo.net/uploads/1/3/0/6/130604166/jimopaxapafid.pdf
    • http://kilnedsy.store/uploads/1/3/0/6/130620380/pijukolatomesuj.pdf
    • http://431775997417950473.com/uploads/1/3/0/3/130323573/ributapusibezesixi.pdf
    • http://wadeladasi.ringbrook.com/uploads/2020/01/28/9405449.pdf
    • http://bestkidsmentoring.org/uploads/1/3/0/6/130604397/3027194.pdf
    • http://courtneygriggseportfolio.com/uploads/1/3/0/5/130588824/bozimozepuvadaxa.pdf
    • http://ingeniouspictures.com/uploads/1/3/0/3/130379482/parunudepizo_zopatidibirapug.pdf
    • http://mydrivingschoolga.com/uploads/1/3/0/3/130323659/684e4dd.pdf
    • http://restaurantwaterloo.nl/uploads/1/3/0/3/130379252/ripimibesaf.pdf
    • http://mylaurabelle.com/uploads/1/3/0/6/130620543/kolaja-kumisilojufiv-mugidikebe-fogeranariwojen.pdf
    • http://mimu.arteltiles.com/uploads/2020/01/28/dopusexagi-vajuzupi-pegike-jopisovetev.pdf
    • http://sweetestdreams.org/uploads/1/3/0/7/130775732/130775732.html#causative+verb+worksheet
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://www.adobe.com/).Noto
    • http://www.google.com/get/noto/http://www.adobe.com/type/This
    • http://scripts.sil.org/OFLNoto

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001436.bin
83fe5e9d66b1f1bfc452a40ba86922a6081c0e9cae95877fe746953ba7254351		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1436 9688 bytes
font_01_sfnt_off0000741f.bin
dcd79678780f9df101063a0971d284418ebab3d6a6f5b539deea1ecddc86f952		 pdf-font-stream PDF embedded font (sfnt) at offset 0x741F 16440 bytes
font_02_sfnt_off000089ba.bin
d22f53fa8ea74fc46865b0450dc373b55f12251b57567c9b3235a767d9ea58f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89BA 4424 bytes

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