Malicious PDF — malware analysis report

Static analysis result for SHA-256 625bd02b24d51f28…

MALICIOUS

PDF

61.2 KB Created: 2021-04-20 05:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec4866908359d05a5140c1836d1445b1 SHA-1: 7c15a449d95847d2722511da9d919b18e8329ded SHA-256: 625bd02b24d51f28dd59da346928a491118ba95706f05485f78ed1aed1ee73f3
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or are part of link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest 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.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8152

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.newburghgroup.com/sites/default/files/webform/resumes/woxofenobe.pdf
    • https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/xetomaroronep.pdf
    • https://www.pharoxglobal.com/sites/default/files/webform/7322176875.pdf
    • https://www.blplegal.com/sites/default/files/webform/32112495638.pdf
    • https://www.a1touchsolution.nl/sites/default/files/kobovigub.pdf
    • https://www.newburghgroup.com/sites/default/files/webform/resumes/tikijoti.pdf
    • http://www.friendlycc.com/sites/default/files/webform/zuguxinukebezukul.pdf
    • http://portal-mysigma.com/system/files/student-proof/pifudolaloxafedotodela.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/55178968397.pdf
    • https://www.ofalloncasting.com/sites/default/files/webform/wibojamivumararevede.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=bose+sounddock+series+1+manual
    • https://ec.europa.eu/eip/agriculture/sites/default/files/webform/95830943344.pdf
    • https://minorsoncampus.princeton.edu/system/files/webform/27732669772.pdf
    • https://drones.princeton.edu/system/files/webform/voretazejujuwewoz.pdf
    • https://lib.asu.edu/system/files/webform/sikukuditizituxabisezopel.pdf
    • https://ubmemeaensoprod.s3.amazonaws.com/ifsec_international/call_for_papers/2021/03/wutiladerotegedubel.pdf
    • https://printandmail.princeton.edu/system/files/webform/85064040694.pdf
    • https://thesanfordschool.asu.edu/sites/default/files/webform/43157208480.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1df.bin
393c9b3f2e97ba228d55e65a2496d81ebfdcb73fd97f535fa44eca41add82650		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DF 5248 bytes

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