Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c1459730210960c…

MALICIOUS

PDF

66.7 KB Created: 2021-04-11 04:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 593da4ba809b5aa694366bef532c1a7a SHA-1: 371d4950b0f29450796cbbfb7d535d53264524dc SHA-256: 5c1459730210960c5732b3a36b7c719077ecb6cbd929b525cbd96e115424591b
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 are part of link farms, suggesting an attempt to redirect users to potentially harmful sites. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this. No scripts were extracted, limiting the analysis of specific execution methods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7867

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.afscme65.org/system/files/webform/11173368180.pdf
    • https://vectorcorp.net/sites/default/files/webform/resume/86303695333.pdf
    • https://www.termis.org/system/files/webform/88699151804.pdf
    • https://www.natsihwa.org.au/sites/default/files/webform/81826716543.pdf
    • http://www.sumnercountyhospital.org/sites/default/files/webform/72664382884.pdf
    • https://ambrose.edu/sites/default/files/webform/juremetepatofuf.pdf
    • http://www.guninetwork.org/system/files/webform/heirri_proposals/44437875789.pdf
    • https://www.uts.cw/sites/default/files/webform/89737617204.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=problemas+de+dilatacion+superficial
    • https://minorsoncampus.princeton.edu/system/files/webform/wetesagepe.pdf
    • https://gradfutures.princeton.edu/system/files/webform/buviboxakutovovujigobimis.pdf
    • https://www.healthdata.org/sites/default/files/resumes/68382108709.pdf
    • https://lib.asu.edu/system/files/webform/90369837207.pdf
    • https://community.princeton.edu/system/files/webform/jidubiziro.pdf
    • https://minorsoncampus.princeton.edu/system/files/webform/libovonudipiguriteg.pdf
    • https://printandmail.princeton.edu/system/files/webform/54002061309.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dff2.bin
00529e12bef91e126ae0301ee7a99630168b835f598caf2dad15cd55eb4cf957		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF2 5324 bytes
font_01_sfnt_off0000f1e0.bin
17ad763341efb915d40c12cd842c15894b6f319c42b7e6cda1aa8d65a11401a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E0 3560 bytes

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