Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f182e05f23c2d1d…

MALICIOUS

PDF

43.1 KB Authoring application: Nitro PDF
MD5: 2421474af00e70496bc571c4e2606ac3 SHA-1: e8107374c8d5c0bc26d358d669e3bd4f0b570c67 SHA-256: 8f182e05f23c2d1d49a6fa822a93d051b7b791ed8bb7a10020e9d11544b3cf91
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links to external PDF documents hosted on various domains. 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 further support the malicious nature of this file.

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://leri.cityglush12.icu/uploads/2020/01/28/bozadoxuke_rusatamoku_tejiwetexuzeko_farut.pdf
    • http://sagishi-ryoko.com/uploads/1/3/0/4/130476427/7182530.pdf
    • http://rnrinc.org/uploads/1/3/0/7/130739086/460208baf508691.pdf
    • http://binnachtees.com/uploads/1/3/0/2/130287462/6521246.pdf
    • http://howtobeaweddingcoordinator.com/uploads/1/3/0/4/130489175/vigefowediwusedelero.pdf
    • http://rod.mu-unsleep.fun/uploads/2020/01/28/2965134.pdf
    • http://thehangaruk.co.uk/uploads/1/3/0/3/130323552/lomugitejera_zokig.pdf
    • http://xrdsfaith.com/uploads/1/3/0/2/130288864/1dba9a1.pdf
    • http://barbaraannkipferart.com/uploads/1/3/0/4/130476885/c67c9ddcfc7e.pdf
    • http://baffen35.com/uploads/1/3/0/5/130551554/zonusaxageb-sepazobonub-wukalexugozof-wekogiwevix.pdf
    • http://suicidepreventionproject.com/uploads/1/3/0/4/130483413/nekud.pdf
    • http://ontrackrti.net/uploads/1/3/0/5/130588686/802627.pdf
    • http://misssupremepurityqueen.com/uploads/1/3/0/6/130603941/130603941.html#english+greetings+for+beginners+pdf

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000137b.bin
db1403a59de7d9e9a68613d007e88d6d11d308e680281f4d82ed44d839d462e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137B 8460 bytes

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