Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4ddb16e9583f436…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 09:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6076c4a272674ad6d11cfd7ac8fe9b36 SHA-1: 51dcb82bff9650e5134b075b47f3b181f805318c SHA-256: e4ddb16e9583f4368bd1d2a7a7d8f87172940e4ffe0b4958fb03bcf28c0d5b72
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. It contains numerous embedded URLs, with a heuristic specifically identifying it as a link farm on disposable hosting. The presence of external URIs and the overall structure suggest an attempt to redirect users to potentially harmful sites for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://crysiq.ru/uplcv?utm_term=friv+math+games PDF link annotation
    • http://ty6600.com/userfiles/file/30263814053.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/16497212904.pdfIn PDF document text
    • http://orderkai.com/uploads/files/vobagikuxowurute.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/girukelagesasegupag.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/pimatebupifetaw.pdfIn PDF document text
    • http://manu-transport.com/documents/file/80748129050.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/28925697831.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/vasixek.pdfIn PDF document text
    • http://cartopack.com/Images/file/benitaxuwababexeme.pdfIn PDF document text
    • http://movediary.com/userfiles/file/gifatubewefitimaw.pdfIn PDF document text
    • http://polkovnik.su/upload/file/mepuwunudute.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/bijibowebowe.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/50383019066.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/63671975350.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///vosep.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/82079744413.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/84470575993.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/ganewezinawinesituzozud.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/75824776127.pdfIn PDF document text
    • http://acelybio.com/upload/files/xedavasibigusupotoj.pdfIn PDF document text
    • https://taperagi.com/contents/files/93287160169.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/fifexid.pdfIn PDF document text
    • https://riwg.in/userfiles/file/kawogiradapinapobip.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_off0000d8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EC 10328 bytes
SHA-256: de40af8ca54084f63bc6b334c5f829b24a88fca503e8f742ad505aedd8be1b35
font_01_sfnt_off0000f040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF040 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10852 17084 bytes
SHA-256: bad736ce5e246136c276a2c0be58e422bf61fee1a802914dc04006f9e2fc67f3

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