Malicious PDF — malware analysis report

Static analysis result for SHA-256 f763ab7499e49ee0…

MALICIOUS

PDF

39.6 KB Authoring application: Karbon
MD5: 249bf6259213e9c4ae5ad020f0b1a4ad SHA-1: 2a624dbf23ce34ce49afc1b9294adc1e13bc52fe SHA-256: f763ab7499e49ee0bce5dad6724aea7aeff8fa7e8c68ccf03ed7d667ad1d3cd4
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. The primary indicator is the presence of a large number of embedded external links, identified as a 'PDF_SEO_LINK_FARM'. These links likely serve to redirect users to malicious websites or to manipulate search engine results. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://blocktekholdings.com/uploads/1/3/0/6/130604859/zazofotasom.pdf
    • http://listmn.org/uploads/1/3/0/2/130289430/0742bc1c8.pdf
    • http://northstarpropertiesct.com/uploads/1/3/0/3/130313410/5650857.pdf
    • http://pbconsulting.us/uploads/1/3/0/4/130483491/8246879.pdf
    • http://birek.pcash.fun/uploads/2020/01/28/8730974.pdf
    • http://simplymetering.com/uploads/1/3/0/4/130435811/92674373ed6639.pdf
    • http://strmopus.com/uploads/1/3/0/6/130620274/bijakodowoz_nelago.pdf
    • http://soapytoad.com/uploads/1/3/0/2/130287307/kapux_dobolonaj_nifelire.pdf
    • http://arcofbrowncounty.org/uploads/1/3/0/5/130588412/zaramobupup.pdf
    • http://nickihumblesbridalbeauty.com/uploads/1/3/0/4/130436058/foniredesuwur_boresodiga_voketolijun_fuwamaxujeg.pdf
    • http://puralidoxu.bbjgamestore.com/uploads/2020/01/28/jajawowifuxag.pdf
    • http://prepaidhomedeductible.com/uploads/1/3/0/5/130550711/lemaxokulaju.pdf
    • http://bsa-sccc-pack301.com/uploads/1/3/0/6/130622110/130622110.html#air+fryer+frozen+french+fries+nuwave

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000138e.bin
bad3c1ff2f3b1376067fdede8ef0842b0d016065c3ad0909e44a13d7b3a15b9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138E 8624 bytes

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