Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7643e7d74a4afc9…

MALICIOUS

PDF

82.9 KB Created: 2021-10-07 22:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 76113b5426aee862a3aad3760e603275 SHA-1: e30ba91e5185d8559e71c1ffb3497cd929151298 SHA-256: f7643e7d74a4afc90c7922555a5c3d4ce48774d0a8e8031d2503be45e1782c64
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the nature of the embedded URLs suggests an intent to redirect the user to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://vnycc.com/userfiles/file/jovunofugekegegegojove.pdf In PDF document text
    • http://mega.kz/media/upload/files/vedogovokodabagazivupox.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/dawenozadu.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/46229975846.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/84950433957.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/kodivawedi.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/36902845479.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210906185542.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/72879125648.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/41566967185.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ekopoxaruvavovo.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/454739699614dcdd6a25f7.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/5462352915.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16149df619427c---4170388682.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/6837720946.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/nesezosemixijame.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/60621680701.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/73235235849.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/21136846487.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/31942977578.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/7def9735fe97e4f55e3f77139a16344b/bovubutadezovasamunija.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/litolufe.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/56359857320.pdfIn PDF document text
    • http://hbinpol.cz/media/images/upload/file/27727673012.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/semibizazibesitu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=male+female+canaryPDF 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_off0000dc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3B 10128 bytes
SHA-256: 710369523d8da58f19374dd88f8a4f928defb5d1161afeb4202c5afab3a30109
font_01_sfnt_off0000f2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CD 19516 bytes
SHA-256: 683a57f445fcff991802a16ea988b540b8ea1de6c16c437e08ba6e091f80dd8e
font_02_sfnt_off0001264e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1