Malicious PDF — malware analysis report

Static analysis result for SHA-256 77249102f03feaa5…

MALICIOUS

PDF

62.4 KB Created: 2021-04-15 23:31:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03e5942d87b69356d9f01320d19c5567 SHA-1: 5d08bf982d46af9884b971c83c89cedb65c81c98 SHA-256: 77249102f03feaa5d9b30db449b1f305da9f516c92a6e5af4b46f362ded2768d
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8016

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/natogaj.pdf
    • https://www.natsihwa.org.au/sites/default/files/webform/25680057182.pdf
    • http://seiary.com/sites/default/files/webform/rec/jizexatunurometubukos.pdf
    • https://www.ofalloncasting.com/sites/default/files/webform/mibotemesasis.pdf
    • https://www.mainephilanthropy.org/sites/default/files/5296457674.pdf
    • http://klm3fg.grhosting.cz/sites/default/files/webform/files/16831560309.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/28911573484.pdf
    • https://www.pharoxglobal.com/sites/default/files/webform/27804174203.pdf
    • https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/87762274679.pdf
    • https://www.ofalloncasting.com/sites/default/files/webform/wibojamivumararevede.pdf
    • https://vectorcorp.net/sites/default/files/webform/resume/dofivefodazewinewes.pdf
    • https://ambrose.edu/sites/default/files/webform/bunovodedodasu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+check+the+transmission+fluid+level+on+a+2012+nissan+versa
    • https://umatter.princeton.edu/system/files/webform/requests/tutoturabawukaxubudevodor.pdf
    • https://thesanfordschool.asu.edu/sites/default/files/webform/43157208480.pdf
    • https://community.princeton.edu/system/files/webform/tujuxegagisezemesolut.pdf
    • https://community.princeton.edu/system/files/webform/xakefabobadu.pdf
    • https://www.healthdata.org/sites/default/files/resumes/sutuzosugogaw.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e283.bin
bde02142c11f065cc6d214c51db0c6294a370ef15bc1345095fe53faa8e509a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE283 5764 bytes

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