Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a34a34c0a06c5e…

MALICIOUS

PDF

41.0 KB Authoring application: Smallpdf Desktop
MD5: ae9347bea359ec350c1b4d538b8cc162 SHA-1: 7d322b60a728f88289c0ea0909d2d693039bd60d SHA-256: c8a34a34c0a06c5efe9a9e7a748097fd80f2871a643d422572a96d59870c7392
150 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, identified by the PDF_SEO_LINK_FARM heuristic. This indicates a likely attempt to generate traffic or distribute malicious content through a link farm. The ClamAV detection and ML classifier further support its malicious nature, classifying it as phishing-related malware.

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://noeticanalysis.com/uploads/1/3/0/6/130603673/7221568.pdf
    • http://theodishthoughts.com/uploads/1/3/0/4/130483817/2489578.pdf
    • http://amplusadvecta.com/uploads/1/3/0/4/130477613/jalufamag-kafugeri-nutaj-wodedifi.pdf
    • http://vuxem.aviakompanija.ru/uploads/2020/01/28/298707.pdf
    • http://midwestasphaltandgravels.com/uploads/1/3/0/4/130478819/5edfe86f.pdf
    • http://paymeprompt.net/uploads/1/3/0/6/130620382/2776139.pdf
    • http://miamilegalcenter.com/uploads/1/3/0/6/130620840/5183751.pdf
    • http://petalesdefleurs.com/uploads/1/3/0/5/130545753/130545753.html#resignation+letter+for+security+guard+in+hindi

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000113b.bin
9967eb8d151746475a141f9a72b405dc952e57f8bfe07fada09cdded328d2b36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113B 7648 bytes
font_01_sfnt_off00005a2e.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A2E 16036 bytes

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