Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b926b2cd9ab121…

MALICIOUS

PDF

42.6 KB Authoring application: Poppler-utils
MD5: 613e334eece74cc1333baafc07beb04e SHA-1: cf291b5f1f0d3249bea8be0f5706d1d18f6002a1 SHA-256: 73b926b2cd9ab121f7095674361ce031ffd211be60f7d3304b5cf1fb966e19e9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links to external PDF files hosted on various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. This technique is often used for SEO spam or to distribute further malicious content. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the sheer volume of outbound links suggests a malicious intent to redirect the user.

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://npccontracting.com/uploads/1/3/0/6/130639226/wifuxip.pdf
    • http://waf.kliningovaya-kompaniya.pro/uploads/2020/01/27/3443119.pdf
    • http://prisonchaplains4nc.com/uploads/1/3/0/5/130540823/1090402.pdf
    • http://appel-stores.shop/uploads/1/3/0/6/130621345/a44ea335696c24.pdf
    • http://camerongunther-weebly.space/uploads/1/3/0/6/130621279/9720500.pdf
    • http://panda-opt.ru/uploads/2020/01/28/9872376.pdf
    • https://kawizugewel.weebly.com/uploads/1/3/0/5/130541188/1709843.pdf
    • http://anabolicsteroidsunleashed.com/uploads/1/3/0/6/130604618/2162944.pdf
    • https://raxupizimav.weebly.com/uploads/1/3/0/4/130476006/1834085.pdf
    • https://dijepifun.weebly.com/uploads/1/3/0/2/130289789/famurije.pdf
    • http://oakislandhomeowners.org/uploads/1/3/0/3/130312957/89b60456ace30.pdf
    • http://rickgillammobileservice.com/uploads/1/3/0/5/130588388/4852fd6f.pdf
    • http://bupavojadi.bikinimag.ru/uploads/2020/01/28/dasazod-wenowevosudom-nakapati.pdf
    • http://useyournoodledoodle.com/uploads/1/3/0/3/130313176/2314648.pdf
    • https://sarijapomakel.weebly.com/uploads/1/3/0/2/130270911/ketepodunasazit.pdf
    • http://zowaj.lernposter.club/uploads/2020/01/28/925315.pdf
    • http://now.barcelonaswing.cat/uploads/2020/01/27/2114191.pdf
    • http://prettiekitteedeals.com/uploads/1/3/0/5/130589286/kilak_wuvat.pdf
    • http://somersetfoodtrail.org/uploads/1/3/0/6/130605248/130605248.html#daphnia+magna+heart+rate+lab+report

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000151a.bin
d6f1eb49a98396d0323198bef45cc82e15f8154476a112b3e49e71336097245c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x151A 8368 bytes

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