Malicious PDF — malware analysis report

Static analysis result for SHA-256 38b7528c172c3553…

MALICIOUS

PDF

42.9 KB Authoring application: Pdftk
MD5: eaf5e72af8c10ec96fd7b8f430bba56f SHA-1: 32f76532db8092845707ede4736f752105c62e4d SHA-256: 38b7528c172c3553da8a828121b9fb7ce5f023cd4b36bd527ec8213ae3794b37
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to external PDF files, a technique often used for SEO spam or to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URLs are the primary indicators of compromise, suggesting a campaign to drive traffic to these external resources.

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 https://zosegeredixiv.weebly.com/uploads/1/3/0/2/130272898/7cd1901b108184c.pdf
    • http://twolips.us/uploads/1/3/0/5/130589077/7907340.pdf
    • http://strongestcbdforsale.com/uploads/1/3/0/6/130621857/ziterig_loxadavivelerur.pdf
    • http://leregut.ale-sajgon.com/uploads/2020/01/28/jipusugix.pdf
    • http://lashesbyjoanne.com/uploads/1/3/0/3/130379266/pokuv-tekoxux-zujinufunojalom-zunitijoxira.pdf
    • http://gon.right-style.ru/uploads/2020/01/28/4524240.pdf
    • http://coolboymusic.us/uploads/1/3/0/5/130543050/piripebudilojuneped.pdf
    • http://juto.gotaserena.com/uploads/2020/01/27/wewewigimikirazoveb.pdf
    • http://stokesed508webpage.com/uploads/1/3/0/2/130288392/130288392.html#typhoid+conjugate+vaccine+dosage

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000122c.bin
f8139443ae1b5fe17f35829f0c9dc3715ddf09d5b7c5ae9f1dd9ddc8a7c2f78a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122C 9008 bytes
font_01_sfnt_off000060e6.bin
5ccb998bb020d0063f1f482dab1b2ae00b166696141407922011380374dc50ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60E6 16204 bytes

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