Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7ea0139eaa17ba5…

MALICIOUS

PDF

70.1 KB Created: 2021-10-02 14:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b98c25606fbb35c9c2d41f84971ebe2a SHA-1: 9bbfaa4d6e4d32050e9bf996ea6574cad3633d1c SHA-256: e7ea0139eaa17ba5b7a58095128ba25618ca64db2a5760e2b970d5a20336d4b5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, and the presence of external links points towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://archism.ru/uplcv?utm_term=non+alcoholic+mulled+wine+slow+cooker PDF link annotation
    • https://intrigantka.ru/images/userfiles/file/50422474758.pdfIn PDF document text
    • http://szwygs.com/upload/gakevab.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/weriruxokufuwipesiji.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161511ab3b3095---55451183278.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/gasavebogatowolujopudeze.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/14695918019.pdfIn PDF document text
    • https://pepsima.biz/files/file/sitawowupiziz.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/78141208410.pdfIn PDF document text
    • https://portofcrotone.com/dati/upload/file/luridasigezoxujid.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/614eb3020746c.pdfIn PDF document text
    • http://lrpharmaceutical.com/upload/files/86133908703.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dde727e8dd---95409008536.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/debuzenigodupilipobirofux.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/giwoteri.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/tukatuvaji.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/kowazipomusulegotonovir.pdfIn PDF document text
    • https://simorgh.it/uploads/file/64718966873.pdfIn PDF document text
    • http://master-br.ru/img/file/revugusiwojanetezali.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/79430699518.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/21038335983.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/36962478075.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_off0000ad3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD3E 17052 bytes
SHA-256: 45deae7eba4cc517dace6dc7f45f660e43cab156f99096b31b784a7c69cd9c63
font_01_sfnt_off0000d889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD889 10792 bytes
SHA-256: 44f66f48a0916d69fdb997fef42f2ce0a18885235661808b080e3e29fe426583
font_02_sfnt_off0000f139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF139 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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