Malicious PDF — malware analysis report

Static analysis result for SHA-256 837c90b33a1f97d7…

MALICIOUS

PDF

36.2 KB Authoring application: Smallpdf Desktop
MD5: 1244b0fbeddc107a764b9d113e9ac381 SHA-1: bae414bf8d3c7728521b6c9f98c6a8e7fa7e8e64 SHA-256: 837c90b33a1f97d7da50373a8f1fc4a79764b334acab2803de09d27115b92829
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or a distribution mechanism for further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. 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://jumbledbatter.com/uploads/1/3/0/2/130292125/mufokiximon.pdf
    • http://milehihbanks.com/uploads/1/3/0/5/130545011/21318.pdf
    • http://charhdofcarmelbythesea.com/uploads/1/3/0/5/130588512/1578275.pdf
    • http://dominguesandkane.com/uploads/1/3/0/4/130489958/nafobid_fuwigujaw.pdf
    • http://coinspacespain.com/uploads/1/3/0/5/130543318/87b6b.pdf
    • http://nctopografia.pt/uploads/1/3/0/2/130272945/merukuwebaxo-sosezoviwopijis-wezexoduv-viwuvogobebu.pdf
    • http://turpinenterprises.com/uploads/1/3/0/6/130604766/jusilod_lexulutosa_jinujute.pdf
    • http://djsilentj.com/uploads/1/3/0/2/130274199/2709966.pdf
    • http://wit.ssl-test-nic-2.ru/uploads/2020/01/29/7760676.pdf
    • http://bebelluche.com/uploads/1/3/0/6/130603783/gunukiwij.pdf
    • http://rehphotography.org/uploads/1/3/0/5/130546385/130546385.html#actuarial+science+mathematical+finance

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000013e4.bin
dbad626420054f61f3d44ae5baebf070045049f868551ee3fdb94ce8808f6c6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E4 7636 bytes

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