Malicious PDF — malware analysis report

Static analysis result for SHA-256 b61d23c8e3cc0291…

MALICIOUS

PDF

62.7 KB Created: 2021-04-10 16:35:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca5525153f79318b80ffc729815bf2b9 SHA-1: 3d3a4059a06f8f8f323995d333eb6aafc9d65884 SHA-256: b61d23c8e3cc02919bf9ec49c6c3e4d33ea0da59c4dcacff7cf618400c898b93
124 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are hosted on potentially disposable domains and utilize UTM parameters, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this pattern. While no scripts were extracted, the structure and embedded URLs strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7654

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.friendlycc.com/sites/default/files/webform/47778491084.pdf
    • https://www.cdcplumbing.com/sites/default/files/webform/contact-us/sawifujemenolezaf.pdf
    • https://www.clinicasfantamaria.ro/sites/default/files/webform/33767122539.pdf
    • https://aboss.by/sites/default/files/webform/zivexovoburowunaxomenip.pdf
    • https://www.jwico.com/sites/default/files/webform/23528315583.pdf
    • https://ambrose.edu/sites/default/files/webform/futexapepunuvanujom.pdf
    • https://ambrose.edu/sites/default/files/webform/zateguzafafidefezibexe.pdf
    • https://www.natsihwa.org.au/sites/default/files/webform/doxuwekuwazomiloxeri.pdf
    • http://seiary.com/sites/default/files/webform/rec/jizexatunurometubukos.pdf
    • https://www.mothercare.ro/sites/default/files/webform/resumes/sojivezogi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=procesos+constructivos+weber
    • https://www.vub.be/sites/vub/files/webform/fazarixi.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e13a.bin
5eab94f9605b6ce61ee313f93b10466d1580992525f48f69d6377188cfff84df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE13A 4844 bytes

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