Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf7f806b89a35183…

MALICIOUS

PDF

68.1 KB Created: 2021-04-07 03:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec0de79342a9b818f9dceb31c2a032bb SHA-1: 51a64cc7a87800ec374b5cac7ec5b5a1d9af7709 SHA-256: bf7f806b89a351834b45edc91199e008d863c5e2641f12f557dc75f10f85fc4a
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable domains and form a link farm, suggesting a phishing or redirection attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies this pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8559

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 http://klm3fg.grhosting.cz/sites/default/files/webform/files/todoxobolukajit.pdf
    • https://www.jsif.org/sites/default/files/webform/kedoruxanagavapiwo.pdf
    • https://www.afscme65.org/system/files/webform/11173368180.pdf
    • http://www.guninetwork.org/system/files/webform/heirri_proposals/rarapenebeku.pdf
    • http://www.sumnercountyhospital.org/sites/default/files/webform/xubapubawaral.pdf
    • http://www.pbttphtk.gov.my/sites/default/files/webform/73261430544.pdf
    • https://ambrose.edu/sites/default/files/webform/93854264345.pdf
    • https://www.dgs-interparts.be/sites/default/files/57515461030.pdf
    • https://www.jwico.com/sites/default/files/webform/vuvosiritixulufanili.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/zomosazufexebale.pdf
    • https://extranet.blanchisserie-toulousaine-de-sante.com/sites/extranet.blanchisserie-toulousaine-de-sante.com/files/documents/justificatifs/bariwogutal.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=etiology+of+traumatic+brain+injury+pdf
    • https://lib.asu.edu/system/files/webform/delibenapu.pdf
    • https://www.ice.cam.ac.uk/sites/www.ice.cam.ac.uk/files/webform/xegenaxug.pdf
    • https://community.princeton.edu/system/files/webform/vujipudujusikal.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfdd.bin
36132632903cf5b8a7edbd9cf9001cb3a484d88e24e640afe9309b2c99100933		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDD 5572 bytes
font_01_sfnt_off0000f2cc.bin
3ae23285cab43cbb2d46ff59ff493c9de980c9a7f681d384d7c1197ca5bca19a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CC 11140 bytes

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