Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf84afc00bda9d18…

MALICIOUS

PDF

75.6 KB Created: 2021-09-18 11:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4846915bb0064f10af3ab6e7dfa643d5 SHA-1: 137a4ed0c6bda6c232ecaddbb9de40ceecc0090e SHA-256: cf84afc00bda9d18d73a549325b37f8c16a16fba4f5de6d1c3725bd9dd8a301f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with many pointing to potentially malicious or unknown domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL distribution are indicative of a malicious document, possibly leveraging embedded JavaScript for exploitation.

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 http://www.s-prom.si/fileupload/file/61732883744.pdf In PDF document text
    • http://sicilyontable.it/userfiles/files/danewu.pdfIn PDF document text
    • https://vpmemorial.net/images/file/nugigoxozaxudebumiwele.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/11191201338.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/zixijakitoxoxemujikepisi.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/12539321877.pdfIn PDF document text
    • https://camphacement.vn/upload/files/ponanuvis.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/20999582677.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/90416356297.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/roxazerukodubikovejabij.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/78394705631.pdfIn PDF document text
    • https://esz.jp/img/editor/files/43768211209.pdfIn PDF document text
    • https://advik.net/userfiles/file/xuvewunawanuk.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/70753983630.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/52370598622.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/27972642086.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/82137837694.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/86045084073.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/lagalanomitap.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/29991601897.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///7229220531.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368b2f02597---68872798358.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/12615877558.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/7617121b1c2860ded5339318bee090b2/55912437293.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=audiomack+apk+modPDF link annotation
    • 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_off0000c087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC087 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD899 18788 bytes
SHA-256: c2888981319ce6f400639458042c55ee6e7cbedaa9eb7652860baa5099d28904
font_02_sfnt_off000109cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CD 10200 bytes
SHA-256: 1f4997e162e960ed3ae32679fd4745855214e43a2dbc1d769cf38cd927702813