Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe4d35f61cbb7461…

MALICIOUS

PDF

61.5 KB Created: 2021-04-06 23:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40d6f249a49ff51b8f8019c0342c2454 SHA-1: a7123b9000dba1bba6019c85239331bb6ac923ef SHA-256: fe4d35f61cbb74614f29f251da8bae141e76c9e4baac09edee8cc0f741060f5c
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to unknown or potentially malicious domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7822

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.guninetwork.org/system/files/webform/heirri_proposals/dagen.pdf
    • http://www.birdlifebotswana.org.bw/sites/default/files/webform/sightings-sketches/lewuxevibonotokezesa.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/fifomibap.pdf
    • https://www.pharoxglobal.com/sites/default/files/webform/6669476875.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/65810703597.pdf
    • https://www.jts.org.jo/sites/default/files/webform/1653940235.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/60015669747.pdf
    • http://www.grotekeukens.be/sites/default/files/webform/gmawards2018/sumeli.pdf
    • http://portal-mysigma.com/system/files/student-proof/pifudolaloxafedotodela.pdf
    • https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/3242210986.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=advocates+remuneration+order+2006+pdf
    • https://campusrec.princeton.edu/system/files/webform/93394875634.pdf
    • https://ec.europa.eu/eip/agriculture/sites/default/files/webform/9071701793.pdf
    • https://community.princeton.edu/system/files/webform/64301273598.pdf
    • https://www.vub.be/sites/vub/files/webform/rifavuzido.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0e2.bin
ac11a1066be5447b33d9f47de1a7cb00f95bc38ec67f4895e5b8ef77db7469c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E2 5748 bytes

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