Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb32033af939547…

MALICIOUS

PDF

76.2 KB Created: 2021-09-24 03:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 673de7279d0504f79c83e0ffd57e5ccf SHA-1: 081d8384547d2a8424a6604f18a34af9a0aa9ad3 SHA-256: dcb32033af939547773acc0ff6bdaa05b38e90d7cc13c1cdf9d479589237a1af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://allytemp.ru/uplcv?utm_term=cheat+bus+simulator+indonesia+unlimited+money PDF link annotation
    • http://abc-tel.ru/data/File/jovafo.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/mubunemekaxase.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/48093879149.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/wipurefidefaripupoxobe.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/22059571478.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/kirufileririludajawapadi.pdfIn PDF document text
    • https://edex.co/userfiles/files/xisekemiwunuzirenuki.pdfIn PDF document text
    • http://klenderbio.com/upload/files/19867279387.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/85958430029.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/wasetuzufujedipataza.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/kabumidazutetela.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3112ec780---66342333897.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/57314315769.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/kikaxija.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/zavevisunixewigixaxeribuz.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/poxaburakoje.pdfIn PDF document text
    • https://ratodua.com/contents/files/82792076276.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/wojeradabiwi.pdfIn PDF document text
    • http://goodmax.ru/i/files/fowaxibokusan.pdfIn PDF document text
    • https://birotex.rs/images/files/sadigo.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4559c6078---wetuponabenigovuwibamoxi.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/kasusagigudibogipolumi.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_off0000c4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF0 10900 bytes
SHA-256: cb4d6966e8f1077514a80f6ec5058b5ec2f841af28e71d340dbea04d95266789
font_02_sfnt_off0000f5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F8 17248 bytes
SHA-256: 8cef0203c06367f26631dde55d2e7412b6163d09969b95b71ce4a658b721fe0d

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