Malicious PDF — malware analysis report

Static analysis result for SHA-256 a37e6fe301b14710…

MALICIOUS

PDF

61.7 KB Created: 2021-04-14 21:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ebbab64015d83c87c6f7b8f456e2e7e SHA-1: 7f8d7d3f98be6f187815e70f44b131910b7a5d8f SHA-256: a37e6fe301b14710034c2b33297f201681b8ec38029b0492f39c8096ad559118
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 pointing to potentially malicious domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is designed to host multiple links on disposable domains. No scripts were extracted, but the presence of multiple external URIs suggests the document's primary function is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7613

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.mainephilanthropy.org/sites/default/files/lipedoketuparukol.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/sidetarebuw.pdf
    • http://seiary.com/sites/default/files/webform/rec/wugibizipudaxejomite.pdf
    • https://www.dgs-interparts.be/sites/default/files/41094691834.pdf
    • http://klm3fg.grhosting.cz/sites/default/files/webform/files/kokibilelage.pdf
    • http://klm3fg.grhosting.cz/sites/default/files/webform/files/5308316073.pdf
    • https://www.natsihwa.org.au/sites/default/files/webform/72789215659.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/75468476758.pdf
    • https://www.natsihwa.org.au/sites/default/files/webform/tesogiruzan.pdf
    • https://www.ofalloncasting.com/sites/default/files/webform/gegemapoxazokex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=att+hitta+f%25C3%25B6rf%25C3%25A4der+genom+dna
    • https://campusrec.princeton.edu/system/files/webform/47045932069.pdf
    • https://community.princeton.edu/system/files/webform/putirufulexuxibo.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db1e.bin
fc5ff4d831501f6f612bf98f2ab059161de778fbcbbb72cb7ca550bc0653cf67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1E 5472 bytes

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