Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bc37ea54bd979e4…

MALICIOUS

PDF

85.0 KB Created: 2021-09-16 19:41:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1f43b97e042cd9299c81c278c7d895c6 SHA-1: 26fbb8dae132ce3810c769a2ae6dc413894134a1 SHA-256: 3bc37ea54bd979e4f9e1d6fae04b9c82cb2ac06d7b71367a31037752e1d77353
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful websites. The presence of embedded URLs and the PDF structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wastran.ru/uplcv?utm_term=play+android+device+manager+ring PDF link annotation
    • https://a-guskov.ru/uploads/files/tibexuposoruxobobu.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b2f9eb68e---gajetu.pdfIn PDF document text
    • http://happy-land.hu/editor_up/67091054989.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/vufawegidivemafovesevejil.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/46869186800.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/92940060543.pdfIn PDF document text
    • http://topp.pl/_topp/file/motavodipofefisi.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/37911461184.pdfIn PDF document text
    • http://teplospectr.ru/images/files/97995127715.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/wapeguvavemoxepifazarudiz.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/gejagafopi.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/64947169229.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/15444849030.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/27742233847.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/tunidorojejogeripi.pdfIn PDF document text
    • http://e-hematologica.com/users/file/26966283108.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/buvapavofepiw.pdfIn PDF document text
    • http://tfforming.ru/d/files/19285195922.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/kixomotozarololiti.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/fedaz.pdfIn PDF document text
    • http://llux.vn/uploads/files/dotokebalifuveni.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/pefepujedogalibezivenujol.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/49210523358.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/74057392721.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_off0000e706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE706 10628 bytes
SHA-256: 5ce3fa7c81cb1b72eefee9ce56aedf2bbe3dcf8cba17d43d68f89b2639089e0a
font_01_sfnt_off0000ff0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0B 18120 bytes
SHA-256: e38270c3f8cfc00f8bceb889bad08bc14bad7ae7da650e720615a651897c4365
font_02_sfnt_off00012e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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