Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb188b1bbdb2c90e…

MALICIOUS

PDF

62.7 KB Created: 2021-04-11 14:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76e630f5f58cf2d30d65ed589a67e039 SHA-1: d50673161a3ed6bd04a2c8df291a7292dda1c4e0 SHA-256: eb188b1bbdb2c90e5dca4950d2baffc4be2c64fd100d3d393eb4b38ba73f0905
124 Risk Score

Malware Insights

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

The PDF contains embedded links that are presented as a software download, indicating a phishing or social engineering attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8119

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 https://ambrose.edu/sites/default/files/webform/99544266771.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/ligexupasofobepis.pdf
    • https://www.mainephilanthropy.org/sites/default/files/49101071505.pdf
    • https://www.blplegal.com/sites/default/files/webform/3097059720.pdf
    • http://seiary.com/sites/default/files/webform/rec/wugibizipudaxejomite.pdf
    • http://portal-mysigma.com/system/files/student-proof/41429692510.pdf
    • https://www.termis.org/system/files/webform/98565071062.pdf
    • http://www.grotekeukens.be/sites/default/files/webform/gmawards2018/98751459569.pdf
    • https://ambrose.edu/sites/default/files/webform/61391242106.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=maschine+mikro+2.0+software+download
    • https://minorsoncampus.princeton.edu/system/files/webform/zotatati.pdf
    • https://www.vub.be/sites/vub/files/webform/86005813007.pdf
    • https://lib.asu.edu/system/files/webform/46247033309.pdf
    • https://minorsoncampus.princeton.edu/system/files/webform/kuwidiloj.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfb3.bin
ad53451a56c3fd43efbf06258b30cba6b5b832f8b2c152b73063ff4c25073255		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB3 5728 bytes

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