Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff5494965ed0d75e…

MALICIOUS

PDF

74.7 KB Created: 2021-09-17 11:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e85b8331977d66583f0581c592ac544b SHA-1: ba867dbd28d0f0bf277db8bca50609ba76c4c2a6 SHA-256: ff5494965ed0d75e18ff641f5add3373d9d070db569e8e59bdfc62a27d15b0c7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The authoring application 'wkhtmltopdf' is often used to generate documents for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://catamma.ru/uplcv?utm_term=watch+good+witch+season+5+online+free PDF link annotation
    • http://jplus-ag.com/upload/files/BodyFile__61439850D626D.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/91017582779.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/61358117067.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/91005146079.pdfIn PDF document text
    • http://anm-av.de/uploads/files/mipokipa.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/83343599104.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/32249542505.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/5aq06c4c9onjc1174jo5tcpjj4/sovemadumelofigafivinaka.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f35ec88b5a---lerij.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210904160008030.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/wefowurodeluzadunopu.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/25552390772.pdfIn PDF document text
    • http://www.startbatteries.gr/ckeditor/ckfinder/userfiles/files/zoviwu.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/42626239490.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/77099125418.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/zaweze.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210904215130.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/73036657264.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/3433922642.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1631578231_1.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/dizonagutubimobitibefuvo.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/dasopirigob.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/tirekebukowofe.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/36214826447.pdfIn PDF document text
    • https://network-italia.com/file/88387566106.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_off0000c075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC075 10968 bytes
SHA-256: 97fe16d9acab57c6997694db257da81f1494bf38ea8d1d958fce7526874f2d65
font_01_sfnt_off0000d9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C6 16752 bytes
SHA-256: a3f8e74bce74681a9d9e86295d1de7f03f0446e859f97f2e5f9ed5b5bafb11f4
font_02_sfnt_off00010565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10565 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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