Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e43db7955c503b…

MALICIOUS

PDF

63.6 KB Created: 2021-04-10 04:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 743973de5b1f52f0f3b95bacc6427d4e SHA-1: 49fe3ca645ae654b7c801c5c11530f5ce3d723ef SHA-256: 83e43db7955c503b0bd1f4436447f1b2530183e8fa20a696cd5af96c88aea0aa
124 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to potentially disposable domains, characteristic of a link farm used to obscure malicious destinations. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8637

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/42406093886.pdf
    • http://klm3fg.grhosting.cz/sites/default/files/webform/files/16831560309.pdf
    • http://portal-mysigma.com/system/files/student-proof/9555400870.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/21030689395.pdf
    • https://www.termis.org/system/files/webform/manejuwavujegajejumoxak.pdf
    • http://seiary.com/sites/default/files/webform/rec/11252708720.pdf
    • http://www.pbttphtk.gov.my/sites/default/files/webform/zoxajetuvu.pdf
    • http://www.grotekeukens.be/sites/default/files/webform/gmawards2018/45910982832.pdf
    • https://ambrose.edu/sites/default/files/webform/74647609277.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=sanaya+roman+soul+love
    • https://www.healthdata.org/sites/default/files/resumes/68382108709.pdf
    • https://www.ice.cam.ac.uk/sites/www.ice.cam.ac.uk/files/webform/tivajojisepizoni.pdf
    • https://drones.princeton.edu/system/files/webform/janewif.pdf
    • https://ubmemeaensoprod.s3.amazonaws.com/ifsec_international/call_for_papers/2021/03/woragirewun.pdf
    • https://printandmail.princeton.edu/system/files/webform/zixulupuritijidegebi.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfa6.bin
d45fffe7ef82e1ddca2a5072609bc74f4a80bf7387be200ec43b03aadb15b924		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA6 5096 bytes
font_01_sfnt_off0000e0eb.bin
2b7a2316fcd94b629ee11909c5f8fde9f080a1948bc24d2872f0807e575ce7be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EB 10768 bytes

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