Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d5ed44e8f1ee008…

MALICIOUS

PDF

76.3 KB Created: 2021-03-09 14:07:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9c3c3d493f396840634b69a04a92473b SHA-1: 99f9d49ba627ecce96f0b67dcc00be1bf5ad45ac SHA-256: 3d5ed44e8f1ee008f00941f891533c9443f104d7c5e7776897c60fbf5aff755c
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://vilenefex.ru/123?utm_term=asthma+treatment+bts+guidelines PDF link annotation
    • http://gizovivomiz.getenjoyment.net/denon_avr-3312ci_price.pdfIn PDF document text
    • http://fanutoragozogow.sportsontheweb.net/kolimoripusapoxer.pdfIn PDF document text
    • http://kujinatazema.sportsontheweb.net/25389491455.pdfIn PDF document text
    • https://sudiduku.weebly.com/uploads/1/3/1/4/131452825/pifavogajob_pixutak_bazisonazuniroj.pdfIn PDF document text
    • https://noxolawozin.weebly.com/uploads/1/3/1/4/131452883/5041704.pdfIn PDF document text
    • https://rokojilezel.weebly.com/uploads/1/3/2/3/132302907/7814181.pdfIn PDF document text
    • http://faripofijukevom.mywebcommunity.org/nejadunexagoninovi.pdfIn PDF document text
    • http://vozuzutiwajuzip.getenjoyment.net/2363164261.pdfIn PDF document text
    • http://vexezujuzas.scienceontheweb.net/electrical_instrumentation_textbook.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5cbbff6b-7c47-4fbb-abda-9de5069fbc88.filesusr.com/ugd/1a89c8_9d0b915edf2747268d43a01d46a0a377.pdf?index=trueIn PDF document text
    • http://fikelamizogu.myartsonline.com/66_national_film_awards_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7df9c9ae-3bb7-4585-9834-d41d498bf05d/85592034179.pdfIn PDF document text
    • https://11ca5eb4-0abe-4d5d-8073-3f36f6088e80.filesusr.com/ugd/8b62d8_15d3f54cb0904a30a1e0ea14cd7f241f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae734b36-a1b0-4826-9e41-9702dd3b7c27/what_are_the_duties_of_a_restaurant_general_manager.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe03e33e-852f-4984-ab52-ec28dbedcc88/pumasopibagaxaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6afe834-aa31-4a75-a841-32f3dadc3865/vekipu.pdfIn PDF document text
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_fe405916c7a147a5ac292cb902c60f4d.pdf?index=trueIn PDF document text
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_51ffc9302db34a37b41cc5bb9faa3d27.pdf?index=trueIn PDF document text
    • https://6c036dbd-b327-4678-b778-de8a2ee7bb50.filesusr.com/ugd/ed64d2_6c02515b5438422bad99799c3bb78015.pdf?index=trueIn PDF document text
    • https://bc732cde-fb09-4fee-8ab5-c82a45a1131b.filesusr.com/ugd/2ac701_ddbeccbca91d452089e4ea6b0d4175a6.pdf?index=trueIn PDF document text
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_e94ff8705de2433aa074803083aeb2eb.pdf?index=trueIn 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_off0000ef22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF22 5368 bytes
SHA-256: 8a9961593879a87347511226bb55be936fb0d19843f75f611f46147a72f6793e
font_01_sfnt_off00010131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10131 10232 bytes
SHA-256: 1d3be2b355a84ffe177405311484f66f2bdd466d8d2cf0d4beac87b470884eb1