Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b250d06a2d0f2b…

MALICIOUS

PDF

32.8 KB Authoring application: Smallpdf Desktop First seen: 2021-09-16
MD5: 1f5bb9d477fa3865c8f6af0def9ca0e7 SHA-1: 40a5c23f657ccd279bd135c16db80f466545ec39 SHA-256: a8b250d06a2d0f2b61d3da936e61be37608c41dbcbfe8fc0a4f28a33af72cebb
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to other PDFs hosted on Weebly. This behavior is indicative of a link farm or a phishing campaign designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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.
  • 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 https://jibusipefakarul.weebly.com/uploads/1/3/0/3/130313037/2924928.pdf In PDF document text
    • https://gowabonebopuluv.weebly.com/uploads/1/3/0/2/130289690/setawejut.pdfIn PDF document text
    • https://mekaginuvarasut.weebly.com/uploads/1/3/0/4/130435772/3485892.pdfIn PDF document text
    • https://nunalaresuzew.weebly.com/uploads/1/3/0/2/130287504/nojosibu.pdfIn PDF document text
    • https://pukitexe.weebly.com/uploads/1/3/0/3/130313480/limuju.pdfIn PDF document text
    • https://bujizawoworotam.weebly.com/uploads/1/3/0/3/130379333/ruraporivobar.pdfIn PDF document text
    • https://zuvijixinaz.weebly.com/uploads/1/3/0/5/130538859/5be471.pdfIn PDF document text
    • https://kitowafarok.weebly.com/uploads/1/3/0/3/130379386/wonisafi_sinisipaxiguw.pdfIn PDF document text
    • https://baxipoxak.weebly.com/uploads/1/3/0/5/130538997/7c11b.pdfIn PDF document text
    • https://buzupijusa.weebly.com/uploads/1/3/0/2/130272909/130272909.html#relative+clause+exercises+pdf+with+answersIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168 7244 bytes
SHA-256: 6fecd63cd3449664aab12a4a0cc907143d6639ba9b69513902dc81955bb7b25a

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