Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d820818f9fdbc9d…

MALICIOUS

PDF

34.9 KB Authoring application: LibreOffice Draw
MD5: 5f4ec9ddd9128aa08f683d77c6220a73 SHA-1: f88e883f36415d723800053bf790a258fdd1fcfc SHA-256: 6d820818f9fdbc9d15dcef28163ec1b9b46615f88cda452176399b8bca31cc63
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains a large number of links to other PDF files hosted on various domains, indicative of a link farm or SEO poisoning attack. The embedded URLs are algorithmically generated and likely serve as a distribution mechanism for malware. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.cypress-it.com/uploads/1/3/0/4/130483142/lijitosijasajidid.pdf
    • http://savethecourthouseclock.com/uploads/1/3/0/6/130603936/gabopanugodowadize.pdf
    • http://saralynnjournal.com/uploads/1/3/0/2/130272395/sedew.pdf
    • http://cookingclassatthotupolaresidence.com/uploads/1/3/0/3/130324027/mazezovomokesitemi.pdf
    • http://oldtownimports.com/uploads/1/3/0/5/130551653/vugitar-kosewif-kajiganefexoz.pdf
    • http://coffeescouts.com/uploads/1/3/0/6/130604749/barulu_kakitibaka_xigoritogo.pdf
    • http://conjecturellc.com/uploads/1/3/0/6/130621267/vumirosaxedadixag.pdf
    • http://jcweetmanlaw.com/uploads/1/3/0/5/130588320/2756177.pdf
    • http://webmail.freemap.nl/uploads/1/3/0/6/130605270/3b89c1cf60d86c.pdf
    • http://mta-sts.mx.kilbrideandassociates.com/uploads/1/3/0/7/130739243/namajalojimemi.pdf
    • http://dancefitdanceacademy.com.au/uploads/1/3/0/7/130775923/b85cdeba5a7.pdf
    • http://smithmountainlakedayschool.com/uploads/1/3/0/6/130604838/451556.pdf
    • http://matthew-zimmer.com/uploads/1/3/0/8/130813829/130813829.html#kvs+admission+form+2020

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002f01.bin
4c6ed0cdb353c93381aa003bbd6acc7783df8c2739525cb795baa980c8b93252		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2F01 8328 bytes

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