Malicious PDF — malware analysis report

Static analysis result for SHA-256 72a0db267a967fe0…

MALICIOUS

PDF

35.6 KB Authoring application: Smallpdf Desktop
MD5: 9762e3ce95b13fd32e6a4171a9f78ad0 SHA-1: 53eb79a34db691ec61d9f5d63b22b400cf3cce14 SHA-256: 72a0db267a967fe0b5f7ccbe260a7aa980e23520d1b68b05f0f7cfc128e50489
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs pointing to other PDF files, indicating a link farm or redirection strategy. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to direct users to potentially harmful content.

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://synchroski.org/uploads/1/3/0/5/130551487/6e5cbe.pdf
    • http://kristen-stone-the-writer.com/uploads/1/3/0/5/130539654/1005332.pdf
    • http://privetst.com/uploads/1/3/0/2/130288986/7899544.pdf
    • http://mufivixubi.nik-vol.site/uploads/2020/01/29/winuwavikuzofeje.pdf
    • http://miguelvaldiviezo.com/uploads/1/3/0/7/130739269/25b870662e1dc.pdf
    • http://gege.bpthere.club/uploads/2020/01/28/jafana.pdf
    • http://metroprointeriors.com/uploads/1/3/0/6/130604065/tedoxutujoxu.pdf
    • http://amsnorcal.com/uploads/1/3/0/6/130605344/e8b54efddea.pdf
    • http://bouvardtavern.com/uploads/1/3/0/6/130604165/wozidinav-lojabifezow-vaduw.pdf
    • http://zepprecisionmachines.com/uploads/1/3/0/5/130547689/gepajuzidex.pdf
    • http://nativenationarts.com/uploads/1/3/0/3/130379146/6f51ede.pdf
    • http://growtem.com/uploads/1/3/0/7/130739122/7300489.pdf
    • http://bernardobellostudio.com/uploads/1/3/0/7/130776041/130776041.html#mata+bhajan++audio
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000129b.bin
98af28bed9e5cbeb0f9ce5bee1fd862ee3074657abf390f7b2e1e9eece53942b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129B 7544 bytes
font_01_sfnt_off00004692.bin
2e4672ecce4327e01615ed9ebf13b170230015f9f2f5286422dda2f4f2b4b588		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4692 7056 bytes

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