Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c350c3bf965b845…

MALICIOUS

PDF

37.1 KB Authoring application: Smallpdf Desktop
MD5: 2c2d544d8250625ca823b0b7e360d7fe SHA-1: 11364bd1a10288a409d5ddaf208e70f5b832a3b4 SHA-256: 5c350c3bf965b8453dc4767d8714683c5576c45af3f76ce491d60172c38284b9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF document contains a large number of embedded URLs pointing to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content, as suggested by the 'PDF_SEO_LINK_FARM' heuristic and ClamAV detection. The ML classifier also strongly flagged this PDF as malicious.

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://www.nauticalglow.com/uploads/1/3/0/7/130775440/rediba_fabojila.pdf
    • http://www.siga.kz/uploads/1/3/0/5/130544386/porolixikodava.pdf
    • http://jamesbrown4judge.com/uploads/1/3/0/7/130775984/5a14a4ac801.pdf
    • http://swampridgewildlife.com/uploads/1/3/0/7/130776147/4096626.pdf
    • http://rescuefog.com/uploads/1/3/0/4/130436252/230081.pdf
    • http://teeth-in-a-day.ca/uploads/1/3/0/5/130544352/fefezixoliteko.pdf
    • http://fonestalve.com/uploads/1/3/0/7/130775835/xulalonele.pdf
    • http://aquazulspa1.com/uploads/1/3/0/6/130620917/7593953.pdf
    • http://www.kub2230xb.com/uploads/1/3/0/4/130435570/1e84dad19.pdf
    • http://partyblitzindiana.com/uploads/1/3/0/5/130588511/kedafozugoke.pdf
    • http://leadershipcv.com/uploads/1/3/0/4/130435774/niligemu.pdf
    • http://sellingwva.com/uploads/1/3/0/6/130639408/9066904.pdf
    • http://www.arcadialabsmiami.com/uploads/1/3/0/4/130479312/gilag-kavikiru-boborivibufe.pdf
    • http://nursingresourcesaz.com/uploads/1/3/0/6/130640179/7d3d42a0555.pdf
    • http://benkregel.com/uploads/1/3/0/6/130640084/1157247.pdf
    • http://brightpassiveincome.com/uploads/1/3/0/3/130379485/datowaxalejerax_wovofusotatu.pdf
    • http://www.nelsonendeavorsllc.com/uploads/1/3/0/5/130551526/datasenotez_pemadupefuzok_danutiwimumom_riribiduketa.pdf
    • http://spiritsbymyside.com/uploads/1/3/0/5/130590413/wojibureligelaxu.pdf
    • http://justinchamplin.com/uploads/1/3/0/6/130604777/zuketi.pdf
    • http://surefirebeats.com/uploads/1/3/0/8/130813497/pajafibukonire.pdf
    • http://stern-line.com/uploads/1/3/0/8/130874397/e2e2c.pdf
    • http://jessicalgervaisbooks.com/uploads/1/3/0/3/130379163/130379163.html#compress+pdf+online+to+below+200kb

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000307a.bin
d68ce6d493b95ce180f2162fbcadc7f6145f13e6215774ce4d476909e719c97d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x307A 7864 bytes

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