Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4acf7398929305…

MALICIOUS

PDF

57.2 KB Created: 2021-04-17 20:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99f7fecf558c821d9f4da51372f8f524 SHA-1: 554636fcb0250fefc5601e86a8f4839743f7ba77 SHA-256: 5b4acf739892930593501ca493f43385d69678bf472fcb962116460953ccda61
124 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially suspicious domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9716

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.natsihwa.org.au/sites/default/files/webform/86947183128.pdf
    • https://www.a1touchsolution.nl/sites/default/files/43963154407.pdf
    • https://ambrose.edu/sites/default/files/webform/bunovodedodasu.pdf
    • https://www.ofalloncasting.com/sites/default/files/webform/mibotemesasis.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/dekif.pdf
    • http://www.guninetwork.org/system/files/webform/heirri_proposals/38059385999.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/99469138220.pdf
    • https://www.woonsocketri.org/system/temporary/webform/51053607868.pdf
    • http://www.birdlifebotswana.org.bw/sites/default/files/webform/sightings-sketches/13349970620.pdf
    • https://vectorcorp.net/sites/default/files/webform/resume/86303695333.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/dakorudi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+hook+up+bose+acoustimass+10+series+ii
    • https://gradfutures.princeton.edu/system/files/webform/16157352895.pdf
    • https://lib.asu.edu/system/files/webform/90369837207.pdf
    • https://ubmemeaensoprod.s3.amazonaws.com/ifsec_international/call_for_papers/2021/03/33404153997.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d133.bin
3984bce902cb9fa503e4b338b7a5a54ccd50a3268d21d77a39db22608c5bd91d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD133 5592 bytes

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