Malicious PDF — malware analysis report

Static analysis result for SHA-256 5552348d067df01e…

MALICIOUS

PDF

82.2 KB Created: 2021-09-10 11:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c0520c16484e6863d8794cf67552bf27 SHA-1: 9a3774dfe4ee198faf9c0f1557bd5b4412538de2 SHA-256: 5552348d067df01e98dd68932240e6cebfea2f4badb4e28d5501929f13b2ed92
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are structured as link farms or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://laborke.ru/uplcv?utm_term=dr+driving+hack+download+apk PDF link annotation
    • http://altadirezione-consulting.it/userfiles/files/tifarisudal.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/83369377271.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/92312769173.pdfIn PDF document text
    • https://eurotig.ro/file/kejomasakofajetukematul.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/47370540572.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/bowizuxomezafutoril.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/vivedenobudejurirub.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/11149575523.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/10147323382.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/73439226225.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/gusajilowuv.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/jikokibugovatikijowi.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/sawab.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/wetaputiwetoso.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/11243037502.pdfIn PDF document text
    • http://beta-rc.com/upload/files/gekejurexumo.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c0d2a071f---pajukevavupibiw.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161394e650e463---kabolivotemitubajofebejej.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/55776441972.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/xuzefaj.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/nimupaf.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/22001640482.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_off0000daec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEC 18680 bytes
SHA-256: 507d99ae10a88a9be8c49b9dc15587af7d15f64b9f07591494c4d005d8589bca
font_01_sfnt_off00010b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001231c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231C 10640 bytes
SHA-256: 0128c5d53f2369ac5daa9dee972139eb301e3f46a489e4d727a9303184d97812

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