Malicious PDF — malware analysis report

Static analysis result for SHA-256 eedf300b6fb11d25…

MALICIOUS

PDF

80.6 KB Created: 2021-04-21 08:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1c3f5d79a0b18e23523b8184acdbd45d SHA-1: e4b363ccde0699a6ef2cabfa8cb00138b9b9f470 SHA-256: eedf300b6fb11d2501f1eb148384e46fac57da41083fced3ff93e4de6e3cf7e2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=what+are+the+objectives+of+mbo PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4382781/normal_5ff996d022719.pdfIn PDF document text
    • http://risozeretelefa.22web.org/air_force_adaptability_test_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527345/normal_60128a8390dc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367013/normal_602c03d3322bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426688/normal_6054080ee58e1.pdfIn PDF document text
    • http://wavakuxakuxom.66ghz.com/scary_phone_call_yahoo_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370266/normal_5fd1cb391dcb1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a529afa0-707c-494d-9cee-e9df2360aa12.filesusr.com/ugd/a6e48a_7da4e526709f4630b3184acfd346e00f.pdf?index=trueIn PDF document text
    • http://fijetetesozaw.epizy.com/gta_vice_city_cars_cheats.pdfIn PDF document text
    • https://78151a86-a557-4e49-81aa-a2539eea45c7.filesusr.com/ugd/204f4f_854c2650296c412e9db951961b0d1f17.pdf?index=trueIn PDF document text
    • https://32e47638-7206-44c1-ad53-5c6f9176402e.filesusr.com/ugd/e00742_ab2e036a8fbc4eae94c9c3fc2fc3af61.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/3714174391.pdfIn PDF document text
    • https://0ffdd24b-620b-4f4d-94ef-a39da1ca20bd.filesusr.com/ugd/853ce2_6859178df7da4164a1eebc62265450ff.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/anselmo_ralph_cupido_album.pdfIn PDF document text
    • https://95fbbc11-640f-4658-acdf-6e09da746871.filesusr.com/ugd/e42ee3_7d065abc37524f82b805d1d7f2b3591c.pdf?index=trueIn PDF document text
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_8f1a9ff824a744c9be6ff6d22fe8bf08.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/nevada_jurisprudence_exam_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nasitevu/80520390941.pdfIn PDF document text
    • http://vubukenod.rf.gd/how_to_make_him_chase_me_over_text.pdfIn PDF document text
    • https://a49a6154-edc8-4132-95a2-c7bb8d673fe9.filesusr.com/ugd/551169_f7eb3c673f924be1a928787e5e9deb3c.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_off0000fd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD02 5380 bytes
SHA-256: c1d7b4ffed296abad9463f3ddd167145b81d546c429319207e3b74fd24ee3466
font_01_sfnt_off00010f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3A 11144 bytes
SHA-256: 4c78bfe1cf9560738a7b244ec5154e1fe0e3b6984f17cbc277c3d9bcac3a5af9

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