Malicious PDF — malware analysis report

Static analysis result for SHA-256 4428e86d0882d6c9…

MALICIOUS

PDF

35.2 KB Authoring application: PDFedit
MD5: 0f9d338aecd86d8ec3a5556159d04e2d SHA-1: 7b5144587076171d3f0316a3d3f773f67b90b878 SHA-256: 4428e86d0882d6c94f6bc614498df8b5135ee4a8a00524e3f930166dfcdac886
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document is identified as malicious by multiple heuristics, including ClamAV and an ML classifier. It contains a large number of embedded URLs pointing to other PDF files, suggesting a link farm or redirection mechanism. The document body attempts to lure the user by pretending to be a school application form, which is a common social engineering tactic. The primary attack pattern involves distributing further malicious content via these embedded links.

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://bestecomerce.com/uploads/1/3/0/8/130874077/a05fb.pdf
    • http://cup054.com/uploads/1/3/0/2/130289632/9702006.pdf
    • http://karmaffne.com/uploads/1/3/0/7/130775134/47f65f4ff30c.pdf
    • http://namastebrown.com/uploads/1/3/0/3/130313491/efb402a8.pdf
    • http://northwesthennepinfamilyservicecollaborative.com/uploads/1/3/0/2/130271099/3965414.pdf
    • http://shawnglover.com/uploads/1/3/0/4/130476786/jijutuwijen.pdf
    • http://patrickeyee.com/uploads/1/3/0/5/130589044/2f54c9620.pdf
    • http://mxwdjty.com/uploads/1/3/0/6/130604905/dadaw.pdf
    • http://www.shop.kitchentablepoker.com/uploads/1/3/0/2/130288551/575499.pdf
    • http://782hustle.com/uploads/1/3/0/7/130776810/jusujofukubezad.pdf
    • http://castlepinesvillagegardenclub.org/uploads/1/3/0/2/130289365/69a3f9d7271fe.pdf
    • http://provencherdesigns.com/uploads/1/3/0/6/130639569/dovugixidemelag.pdf
    • http://engineeredbydesign.net/uploads/1/3/0/6/130620916/ruxirulugetila-mupijovaruwaj.pdf
    • http://scope-for-growth.com/uploads/1/3/0/6/130604006/poxam-sogizeguwuk-fikuba.pdf
    • http://shopninetwentyone.com/uploads/1/3/0/5/130589037/nexigilawokoto-munarob.pdf
    • http://stagingserver5.com/uploads/1/3/0/6/130621836/nuropemozenukijoru.pdf
    • http://naturalproducts.shop/uploads/1/3/0/8/130874366/tupiwamikakukukuzilu.pdf
    • http://nathansdetailing.net/uploads/1/3/0/6/130620451/werobe.pdf
    • http://sugarvedelmiesmunkavedelmikft.com/uploads/1/3/0/7/130775076/ef0fb4.pdf
    • http://winningft.lucky1st.com/uploads/1/3/0/6/130604708/130604708.html#kendriya+vidyalaya+school+application+form+download

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002bc7.bin
c4b89d79046b617dff8b5dc2bbabfb827cc0503b77cf51cafc603eee28b72727		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2BC7 7524 bytes

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