Malicious PDF — malware analysis report

Static analysis result for SHA-256 57779e28b7c6420d…

MALICIOUS

PDF

81.2 KB Created: 2021-03-31 06:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c45db2a8f5e72cd3a037e1ebe187ae84 SHA-1: e0f8faf7ac078ba626320c3371b64d1d169d8c34 SHA-256: 57779e28b7c6420dc0435e9f484a43d8459a3a1c06a2ced31fff398391d46df7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

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://leonvi.ru/strik?utm_term=tv+show+sponsorship+proposal+sample PDF link annotation
    • http://gixapedotamerow.mywebcommunity.org/46482505976.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382629/normal_6032990825ad4.pdfIn PDF document text
    • http://datinge.site/moniwpzxaf.pdfIn PDF document text
    • http://nomevufaneboja.mypressonline.com/lozam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473064/normal_6023e93eb4211.pdfIn PDF document text
    • http://lnstagramverifiedsbadgesforms.com/where_is_system_preferences_in_settingsk61gk.pdfIn PDF document text
    • http://gapilojazixo.getenjoyment.net/86834134756.pdfIn PDF document text
    • http://fashion-deals.xyz/20326156235t5bzr.pdfIn PDF document text
    • http://about-central.com/trimble_s6_dr_plus_specsh63pl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://c4a0f302-b060-43a0-af10-a0364da5eca7.filesusr.com/ugd/c6d327_49b90c774a514c9aacd273b56fa32276.pdf?index=trueIn PDF document text
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_4d7d36e406b84b3eab47fc22fc50b733.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/ruzotenijugiguxogu.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/26120604359.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/incisal_guide_table_function.pdfIn PDF document text
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_1908355393b1499f8597d40e0fc45872.pdf?index=trueIn PDF document text
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_e108eefad0ed4d25ab8672cee718bfe9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/tuteferij.pdfIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_6b4d38f0a2ac4878808fcd9dcaf59d40.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41D 4868 bytes
SHA-256: 6fca7690bc124f7a3e995f02737d29bc3cd95c7a29668cd02e1e833924aa9759
font_01_sfnt_off00010479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10479 10916 bytes
SHA-256: 3d2e7a4db888260843a8f43f745fcb615204094840a86caf57acd96eee805a66
font_02_sfnt_off000129a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A7 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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