Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c40ce242c196542…

MALICIOUS

PDF

77.0 KB Created: 2021-06-06 09:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 2d9fc9e60895a3b4d25c5adfc62be2fa SHA-1: f116a6cc50d3657b982e0a3109fc15bb9b1e0441 SHA-256: 6c40ce242c1965421d8a9158bfa37bd2cd98540458e02bcdb235ad1c7f68c34f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to link farms hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the nature of the embedded links, which are likely used to redirect victims to malicious sites.

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://nipisod.ru/123?utm_term=milestones+document+template PDF link annotation
    • https://xepekozodixati.weebly.com/uploads/1/3/5/3/135346226/c232beb93e35d.pdfIn PDF document text
    • https://morozosewiveloz.weebly.com/uploads/1/3/4/3/134387595/bikutikidagemu_segosi_pirijibop_lujilomil.pdfIn PDF document text
    • https://lenudigibelap.weebly.com/uploads/1/3/7/4/137499492/1866865.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487888/normal_5fec138f03506.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486359/normal_6045c6fd5879c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuwajesorewo.pbworks.com/f/46112698876.pdfIn PDF document text
    • http://vatojorisa.pbworks.com/f/sezedadetisarenibek.pdfIn PDF document text
    • http://lulatigono.pbworks.com/w/file/fetch/144540984/levebuwoliril.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/f/how_long_does_ogilvie_home_perm_last.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18716008-f413-499c-96a7-d2fbb48cc2c7/42_laws_of_power_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a5946ab-1e8c-443b-8a1b-70dc27e58ad5/download_kumpulan_film_warkop_dki_full_movie.pdfIn PDF document text
    • http://sovamexor.pbworks.com/f/standard_of_perfection_rabbits.pdfIn PDF document text
    • http://juwelite.pbworks.com/f/zemibirobanufupujexawobix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f83a70f-1fe1-4ad4-850b-2c3ab602908d/53887991250.pdfIn PDF document text
    • http://zawepiko.pbworks.com/f/algebra_worksheet_for_class_6.pdfIn PDF document text
    • http://xorunezagu.pbworks.com/w/file/fetch/144564216/best_sites_to_watch_hindi_dubbed_hollywood_movies_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba85a983-de47-4f18-9347-c3e76d68207f/46096062848.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c892837c-6013-409f-a3bd-a5629cdf293b/befijidagikebunovexeji.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_off0000f148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF148 5128 bytes
SHA-256: d1188d1a0e6375c95e5ab6aa7f1eedd3e9d44d301fcf0754bfab97240d3d45cc
font_01_sfnt_off000102b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B2 10660 bytes
SHA-256: 47149f5e16836fdd18b8823d7e38c6babb18438862acd1407672dc22ca0857c5

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