Malicious PDF — malware analysis report

Static analysis result for SHA-256 c584e224128b2d50…

MALICIOUS

PDF

74.7 KB Created: 2021-09-20 23:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 78f03644635111d997e72173753d7ee0 SHA-1: b258fb854dd819c8a65e7e4aee28258caebf11ff SHA-256: c584e224128b2d508625a373179d430c1695fd41e66dcbafd82b160fe40624ab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs that point to external sites, many of which are structured as link farms. The presence of 'utm_term' parameters suggests tracking or phishing campaigns. The document body, though heavily obfuscated, contains references to URLs that likely serve as lures to download further payloads or redirect to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://irlanc.ru/uplcv?utm_term=zolaxis+patcher+part+9 PDF link annotation
    • http://top1np.com/ckfinder/userfiles/files/naginuwoxe.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/duliweduzifozibilujipi.pdfIn PDF document text
    • http://sangsangins.com/upload/upload/file/vutizufaj.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/soserabizetamib.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/20536303399.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/wikoto.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/63203910915.pdfIn PDF document text
    • http://www.polni.si/Images/files/sugatogazajavulakuzema.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109180354337793.pdfIn PDF document text
    • http://101balkon.ru/upload/files/55924655537.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130e4b097beb---peselol.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/45278684518.pdfIn PDF document text
    • https://eco-translation.ca/upload/editor/file/kumogudijajufugasose.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/susudasukofuxudapalet.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/66c509927d47786d22b57a23903115c9/jomapiwegabogufuma.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/puzavalumevazo.pdfIn PDF document text
    • http://ned.ru/uploads/files/silowasexotinekakuwemadax.pdfIn PDF document text
    • http://vodova51-53.cz/files/vinetodugixatuvobezor.pdfIn PDF document text
    • https://badrivishal.com/media/malujomadojuxedigetab.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161398ce225ea0---52933441818.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/zedomafofovafipabexika.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/75496284176.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/6737910379.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_off0000c016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC016 16960 bytes
SHA-256: 951523486a889388769b60410d72d709f64a9f9264477fc62f568f98fb50d144
font_01_sfnt_off0000ec37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC37 10600 bytes
SHA-256: ee8cfa09d16fe5014087738fbb11f5216a000f54b6ff049b0ec653dedb20645a
font_02_sfnt_off000104b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1