Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf65b397d716dafe…

MALICIOUS

PDF

85.3 KB Created: 2021-09-18 00:38:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3ce8cde66640bdb9c8248b37b4288b3e SHA-1: bacc5689abc0714965cce0adb42cd8393d7b1679 SHA-256: cf65b397d716dafe5409a2e34244a4131b9883cbec7e230482c8b07ab8d991b1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, and a heuristic identified it as a link farm. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest it may be used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://cornucopiafrederick.com/uploads/files/84037917219.pdf In PDF document text
    • https://apra.pl/files/file/83478401368.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/sobupivumiz.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/pokuguvuratake.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1d3d1d284d749fdc8a346d2dcb209cf2/jemuwimevabibiraropumup.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-8/20210908081713776564.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/69397320538.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/worelawixat.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/16111844238.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16138df0a90e42---lesegobaxumewigaletozom.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/78299995644.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/83518512764.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/pemiwivalibadupubonasegir.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/92983987988.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/kabupises.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/48311084746.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/sovekebifofapewagexaf.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/6490154301.pdfIn PDF document text
    • https://aaaxxion.info/images/file/95030017958.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/mutorinu.pdfIn PDF document text
    • http://keacg.com/upload/files/25904331892.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=best+euchre+app+for+androidPDF 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_off0000e989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE989 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A0 10824 bytes
SHA-256: 25f7d8e07427aa7293d9dc9d89d886a6db7f11ca299820d98e55972a8d62bb14
font_02_sfnt_off00011a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8C 17532 bytes
SHA-256: 4ec33f52b2c9e656df1cd940cbf1a6d5d87585c24d6c36673d8fb9ba147bd65c

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