Malicious PDF — malware analysis report

Static analysis result for SHA-256 785342e0ead22895…

MALICIOUS

PDF

64.0 KB Created: 2021-04-24 22:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06fb4294fb5a38e81654143931aa35be SHA-1: 5b352d7bbc0f9ced0cd745067daea2153276c522 SHA-256: 785342e0ead22895b9e3a1a6d1cdac9112f42d220e5d6d8aa6536293016276eb
124 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as a phishing trojan and a machine learning model indicated maliciousness. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a pattern of using disposable hosting for links. No scripts were extracted, but the presence of external URIs and the overall structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9627

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.jwico.com/sites/default/files/webform/66271497470.pdf
    • https://www.termis.org/system/files/webform/98565071062.pdf
    • https://www.a1touchsolution.nl/sites/default/files/73086307569.pdf
    • https://www.woonsocketri.org/system/temporary/webform/mupiroto.pdf
    • http://russian-ice-spb.ru/sites/default/files/webform/files/69309865186.pdf
    • https://www.afscme65.org/system/files/webform/52844377902.pdf
    • https://www.ofalloncasting.com/sites/default/files/webform/mibotemesasis.pdf
    • http://www.guninetwork.org/system/files/webform/heirri_proposals/38059385999.pdf
    • https://architecturaldesigninc.com/sites/default/files/72694480293.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=el+general+naranjo+serie+completa+online
    • https://ubmemeaensoprod.s3.amazonaws.com/ifsec_international/call_for_papers/2021/03/wutiladerotegedubel.pdf
    • https://ec.europa.eu/eip/agriculture/sites/default/files/webform/95830943344.pdf
    • https://thesanfordschool.asu.edu/sites/default/files/webform/87767597376.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db1d.bin
cde0c6e4e5026d745048d2ddc03cb0a3227633b893e402dd6b978aac77ed8e13		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1D 5284 bytes

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