Malicious PDF — malware analysis report

Static analysis result for SHA-256 9202471f0eb80438…

MALICIOUS

PDF

78.9 KB Created: 2021-03-09 17:35:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 6c5bfb03bfe98233d3911ae0cfb35962 SHA-1: 137e4e114d4779e35e8f944e54f3f3bb53eea441 SHA-256: 9202471f0eb80438db5ed0e7082ca6c7739f806d1ddd7867c0118f18a5ea66ab
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifier indicated high maliciousness. It contains numerous embedded URLs, with at least one, https://golowaki.ru/award?keyword=anacreonte+obras+pdf, identified as a potential lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host many links on disposable domains, a common tactic for distributing malicious content or conducting phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://golowaki.ru/award?keyword=anacreonte+obras+pdf PDF link annotation
    • http://mx50off.pro/kixoliwerovites426sv.pdfIn PDF document text
    • http://xupulakikovuxo.mypressonline.com/43273863328.pdfIn PDF document text
    • http://smartbright.club/99741211973j07he.pdfIn PDF document text
    • http://rejasikega.scienceontheweb.net/cursos_primeros_auxilios_gratuitos_madrid.pdfIn PDF document text
    • http://dajexori.mypressonline.com/world_war_z_movie_online_watch_free.pdfIn PDF document text
    • http://ziwewixowele.sportsontheweb.net/define_reliability_in_software_engineering.pdfIn PDF document text
    • http://fojukivijivik.medianewsonline.com/electrical_engineering_book_download.pdfIn PDF document text
    • http://ramuwesitavoz.mywebcommunity.org/18295526715.pdfIn PDF document text
    • http://supariwepexafat.mywebcommunity.org/66059667302.pdfIn PDF document text
    • http://faripofijukevom.mywebcommunity.org/does_act_workkeys_matter.pdfIn PDF document text
    • http://naliputa.mywebcommunity.org/famazepigukowifexukuleb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_8cf5d89b2685447cbff2a8a5e6994a76.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/567d9f5e-73fa-4afa-b3e1-f2d566cf8398/darren_hardy_sunday_planning_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef251244-e00b-4bd4-a75e-61ea868702af/49272267678.pdfIn PDF document text
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_084760cef95e43c8981368747741a211.pdf?index=trueIn PDF document text
    • https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_87f4c8d1423e4dfa946100215b842d78.pdf?index=trueIn PDF document text
    • http://jusopetikikij.onlinewebshop.net/gawaloresomuzo.pdfIn PDF document text
    • http://nojikigor.myartsonline.com/allophones_of_one_phoneme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e740c98a-0d1e-4aa2-9ba4-d975045da92e/60895290876.pdfIn PDF document text
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_d4b9fc4f6b0a491faba4a06abc687e47.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cc7d76c-b222-4979-a79b-6cdc38f982f1/hp_envy_4500_printer_help.pdfIn PDF document text
    • https://ef9d90ca-5811-4a1c-810e-75bcfae60121.filesusr.com/ugd/a33af7_65a41488d9d54be3a989ddfa6e383cfd.pdf?index=trueIn PDF document text
    • http://sabiwilurase.atwebpages.com/extraordinary_popular_delusions_and_the_madness_of_crowds_sparknotes.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF514 5248 bytes
SHA-256: 16507fc262a0e0eaf86b457bed860106824676bb6c042c79a2e6db1825f2b208
font_01_sfnt_off000106f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F8 11708 bytes
SHA-256: bc72641c5f72297d5349e2c2a475f7e49bf17aef9b7f03f698c7482cdfbef31b