Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a076e72da917d24…

MALICIOUS

PDF

81.1 KB Created: 2021-09-19 09:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2c9e4846e85019ef5e600e64acda74fa SHA-1: 6f9847e9f2c691f13612ba8f6c91f8ef1b43b500 SHA-256: 5a076e72da917d24260a4277158bdd88304dd5abd8a638ecb509f3080980d001
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. The PDF contains numerous embedded URLs, with one specifically identified as a link farm hosted on disposable domains. This suggests the primary purpose is to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://koreaseals.com/ckfinder/userfiles/files/bojapedilitekofe.pdf In PDF document text
    • http://www.allatpatikapecs.hu/images/file/3845924467.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/41496845101.pdfIn PDF document text
    • https://eniedu.com/data/file/20210910030703.pdfIn PDF document text
    • http://precisao.org/files/files/liwagizire.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/fufutezigu.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/60445490220.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/tafesiki.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/78492156659.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/zoresopin.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/kumez.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/90131098265.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210910101121.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/58375783195.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/nidosena.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/53c6cfd45e730b359a8a1d13455de4f8/40934668080.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/13064630544.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/23738536051.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/56462806302.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/86139620844.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/pevixofujuxuvufize.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/28906773390.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/kiwusazugopizasuw.pdfIn PDF document text
    • https://gilbertems.com/videos/file/21105215542.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/jamejukopipajepobob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=como+reinicio+mi+huaweiPDF 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_off0000d8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B1 18572 bytes
SHA-256: 59ea3ed48aeab32f0a6ebc757c8dd09d5866058f13fc949ded7310c6ef5d587c
font_01_sfnt_off000107c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD7 10400 bytes
SHA-256: a4e5458fbabb7751d832a3a066b7cb878ae0fe35227d6a579b687de68c9809f6

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