Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c3115069767db09…

MALICIOUS

PDF

85.5 KB Created: 2021-09-12 19:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a2470ab1132aee5d12ae5737641ec099 SHA-1: 4822ede2b2d2120d430b90fcf108929ca7b2b66f SHA-256: 2c3115069767db09bb52f9f736945eb210cc39a30af7bc9be4dc9b468b9827eb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs, many of which are structured as link farms on disposable hosting, suggesting a phishing or malware distribution campaign. The presence of PDF-specific heuristics like PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM indicates the document's primary function is to redirect users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=we+are+legion+we+are+bob+pdf PDF link annotation
    • https://dom4m.de/userfiles/files/kekidojizezofoxebogas.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/14543574744.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/70502645691.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/23784337265.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/48218651795.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/92417893943.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/82837333197.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/sn1r917aa4d58cl7fpi0jf5u04/jevevamisekezotemawofefo.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/tifiwanezujunudikusim.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109011559008740.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/31214178059.pdfIn PDF document text
    • http://ore-processing.ru/d/files/457038431.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/vafuvebupivalafazukuvoj.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/95473463849.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/17266265991.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/zisodupuliz.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/jufapetufe.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/64179193624.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/39430666263.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/jusinedo.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/lezavukoboxupulamituzije.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f479779e8d---mijunositokozi.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/89251979638.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/newajapixopo.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/25940638200.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_off0000e87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87E 18476 bytes
SHA-256: af72e71d49a1781dc8ec35b94a8465906572c440ca41428048da35499698e109
font_01_sfnt_off0001181a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13031 10628 bytes
SHA-256: 5a9c032b71986a8898dac88761a70752170cb8f706b2aecac17b9bf6fb176658

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