Malicious PDF — malware analysis report

Static analysis result for SHA-256 01ad310c6bf1c4f1…

MALICIOUS

PDF

63.7 KB Created: 2021-04-21 04:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a425a723a6aca68624be4ab3e0bcf5e5 SHA-1: d1da6e010f522e08c41869634c6aabe0522068cf SHA-256: 01ad310c6bf1c4f1ba3c4b58b5534c6e90d500cd75df163b9b8054f168bd07d3
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 explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, often as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8278

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://www.enwidth.com/sites/default/files/webform/resumes/58607877977.pdf
    • https://aboss.by/sites/default/files/webform/89266631471.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/71502920023.pdf
    • http://klm3fg.grhosting.cz/sites/default/files/webform/files/30253637425.pdf
    • http://russian-ice-spb.ru/sites/default/files/webform/files/40307308503.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/89382212171.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/47147916176.pdf
    • http://pilgrimland.com/sites/default/files/webform/resume-uploads/woluweweketasuzizolog.pdf
    • https://www.uts.cw/sites/default/files/webform/58994315224.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=does+air+density+increase+with+altitude
    • https://www.ice.cam.ac.uk/sites/www.ice.cam.ac.uk/files/webform/10713621665.pdf
    • https://printandmail.princeton.edu/system/files/webform/fasulegok.pdf
    • https://thesanfordschool.asu.edu/sites/default/files/webform/fapivo.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec59.bin
f6f559c9663196d1bad6bf3dc7c24f4366b8451487a606efba53654c99e19d4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC59 5104 bytes

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