Malicious PDF — malware analysis report

Static analysis result for SHA-256 56b4092676029566…

MALICIOUS

PDF

87.6 KB Created: 2021-10-12 15:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9ffde4e5761a6580c0fe90935447a687 SHA-1: 88a54465ea946416c6b26bde27a40dcdab3ebf67 SHA-256: 56b4092676029566f66738e4911ed40aed6b559e2635bc76fc03a415bca73927
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed as a link farm on disposable hosting, with numerous distinct hosts and UTM parameters, pointing towards phishing or malware distribution. The embedded URLs, despite some being marked benign, contribute to the overall suspicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://elma1.ru/!upload/files/30298441244.pdf In PDF document text
    • http://oecschool.com/userfiles/file/40659271797.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/36140491444.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/17385289575.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1615708a906ef4---zemozama.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/161349cb1eb550---73248101179.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/47638310767.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109031920209530.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/zilukivalejixebudaf.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/15564557052.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/84932145079.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/29112120026.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/6472507255.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/xagikojunekoxonajulop.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/worexifizomulusoxesimolo.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-13/20210913234724164397.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/fomovu.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/41099386464.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/ruses.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/75768630437.pdfIn PDF document text
    • http://deauville.ru/files/file/mokoziwokemikizoj.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/76766867997.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/36220601020.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/Z3ufxtS7Wvw/uplcv?utm_term=kicking+and+screaming+full+movie+onlinePDF link annotation
    • 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_off0000ed21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10538 10968 bytes
SHA-256: 797e5dcebbffe86b1569401c75ac1860ff4c18c223f6a0a53a67278a792b9b48
font_02_sfnt_off00011e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7E 19544 bytes
SHA-256: 76ca5aaa61c1edff94918d434afc2f4cf36d584d4fd8b0e6388f8f8f4d719f03

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