Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f8b4df53af7e6c…

MALICIOUS

PDF

75.2 KB Created: 2021-04-11 04:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 705d0602a85224d5f351f3b552f9b521 SHA-1: 76e88a9c2f215554a6340bf4d3131ed0461db7f2 SHA-256: d3f8b4df53af7e6c667f35bc1433be38e84e7df652a171fea85488f37f748dd6
124 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8924

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.muttypawsacademy.com/sites/default/files/webform/vaccines/65827293628.pdf
    • https://natsihwa.org.au/sites/default/files/webform/degajakuko.pdf
    • https://www.a1touchsolution.nl/sites/default/files/64517041799.pdf
    • http://www.guninetwork.org/system/files/webform/heirri_proposals/32710798707.pdf
    • https://www.mainephilanthropy.org/sites/default/files/lipedoketuparukol.pdf
    • https://www.woonsocketri.org/system/temporary/webform/51053607868.pdf
    • http://www.friendlycc.com/sites/default/files/webform/74296331991.pdf
    • https://www.jwico.com/sites/default/files/webform/69174909787.pdf
    • https://architecturaldesigninc.com/sites/default/files/masugikiretige.pdf
    • http://www.pbttphtk.gov.my/sites/default/files/webform/fadubapep.pdf
    • http://spotlight-sites.com/sites/default/files/webform/loboje.pdf
    • https://www.jwico.com/sites/default/files/webform/47965191786.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=surprised+by+truth
    • https://minorsoncampus.princeton.edu/system/files/webform/janoruzafasolefixos.pdf
    • https://community.princeton.edu/system/files/webform/36479690150.pdf
    • https://printandmail.princeton.edu/system/files/webform/83605599331.pdf
    • https://printandmail.princeton.edu/system/files/webform/83401752781.pdf
    • https://www.vub.be/sites/vub/files/webform/lijulur.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103e1.bin
08adbd9f8a3ec2d65a85f8325a46434cccdc1ba4f6dc2242d27c272838ed56cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103E1 5148 bytes

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