Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ebedc31f998f5d3…

MALICIOUS

PDF

80.3 KB Created: 2021-10-08 17:36:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 02a307235643a2962d8016f2284164e2 SHA-1: 1885899fe3aefcd345986f37e20f0e5d90d4106d SHA-256: 5ebedc31f998f5d374ebfb8a15ff2e8df8f70b45fd78aca51f3c514afca1c854
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further indicating a non-legitimate purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=learn+to+tap+dance+near+me PDF link annotation
    • https://mimpishio1.com/contents/files/sozekem.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/18434038491.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/zatamifoxaxujija.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/21306351293.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/sabomafa.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/32930774645.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/pivedukikitebed.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/8730704659.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/zasuviromonasowavubire.pdfIn PDF document text
    • https://suprastoc.ro/userfiles/file/wizuvigodofelu.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/83057307400.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/tofovizoxajufode.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/80661963606.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/jatagegimekilofizuga.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/77605771195.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/87512023707.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/tofamefubib.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/28749691385.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/79189903933.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/31565285195.pdfIn PDF document text
    • https://shibbirs.com/media/files/58778400989.pdfIn PDF document text
    • https://socardan.com/userfiles/files/62860876762.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/pajawovigax.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/gatodesokunabivonomutirox.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC81 10324 bytes
SHA-256: 70b99a15750af683c92c4e938f7e9097b8154d5d08163c932bd72f5da4df0cdf
font_02_sfnt_off000103b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B8 18260 bytes
SHA-256: 324a1b1c7ecf1e8f33eadf4d2429c067ac92f936cc8c98984e175e6cff98c500

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