Malicious PDF — malware analysis report

Static analysis result for SHA-256 4320ed8be1210b7e…

MALICIOUS

PDF

100.9 KB Created: 2021-03-21 03:34:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b786969dfc2881316745fdf66152ea56 SHA-1: 71a916cc16130cfcd0c2f3406ba6d8629a63aaf0 SHA-256: 4320ed8be1210b7e2d019439a489cfb7684275bb9abb0e51ab30b31a63b82ac8
184 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, characteristic of a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs suggest an attempt to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8870

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/award?keyword=big+ideas+math+advanced+2+teacher+edition+pdf
    • https://cdn.sqhk.co/mogizilo/VhhiOG8/8038534024.pdf
    • https://vojidejera.weebly.com/uploads/1/3/2/6/132695434/gonideve.pdf
    • https://static.s123-cdn-static.com/uploads/4393208/normal_5ffb42a74adfb.pdf
    • https://bamufikike.weebly.com/uploads/1/3/1/6/131606241/6302268.pdf
    • https://jubaluwaruzazux.weebly.com/uploads/1/3/2/7/132740890/cbdb522ee4.pdf
    • https://cdn.sqhk.co/joxezexukub/sU3jYgg/2019.pdf
    • https://nixabuvibowigev.weebly.com/uploads/1/3/4/3/134308208/a27099da94.pdf
    • https://static.s123-cdn-static.com/uploads/4411270/normal_5fdd3a15d4267.pdf
    • https://cdn-cms.f-static.net/uploads/4470521/normal_60207f3d6a994.pdf
    • https://lurufabufukigo.weebly.com/uploads/1/3/1/4/131407807/04a53b.pdf
    • https://norofuzalugegok.weebly.com/uploads/1/3/4/8/134882219/folopebex-wedosawu-wumixo-jovafogoruda.pdf
    • https://cdn.sqhk.co/dasoxitif/jhjZYdA/tc_application_for_college_format_in_english.pdf
    • https://remogomati.weebly.com/uploads/1/3/4/7/134748537/17749b079447.pdf
    • https://lujipened.weebly.com/uploads/1/3/2/7/132740552/4883137.pdf
    • https://static.s123-cdn-static.com/uploads/4388279/normal_5fc99588a9511.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mikibetiv/allen_bradley_compactlogix_selection_guide.pdf
    • https://uploads.strikinglycdn.com/files/ede2b28b-cf20-4c66-86bd-7155e51f6eb6/bunimanedaletefuwa.pdf
    • https://uploads.strikinglycdn.com/files/b5b13a5d-c6eb-46b0-a479-54617bcd1a82/newtons_laws_of_motion_brainpop_quiz_answers.pdf
    • https://uploads.strikinglycdn.com/files/9c907d95-27ef-418d-8726-7a8a123d9154/64591400647.pdf
    • https://uploads.strikinglycdn.com/files/a2474640-bdec-47b4-91f5-e9b004318fa5/xagiravopitutokenupaset.pdf
    • https://uploads.strikinglycdn.com/files/8ffc4f06-9655-417c-a47f-aeb8622b8154/wii_safety_manual.pdf
    • https://s3.amazonaws.com/makumapikeze/tediw.pdf
    • https://s3.amazonaws.com/vufupu/sazifibewo.pdf
    • https://s3.amazonaws.com/jojitagifuva/fight_club_anti_consumerism.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016577.bin
57c9a343c56d42c9fd181c1df4ee0ca3199c171e4ee0c386a220f9627226db2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16577 5780 bytes

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