Malicious PDF — malware analysis report

Static analysis result for SHA-256 f94bc8d757a8c824…

MALICIOUS

PDF

90.4 KB Created: 2021-09-13 00:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 17c49730535f0107e87c38342b652bab SHA-1: 64bd7884ce578990f7b39ffac17013de28c4025c SHA-256: f94bc8d757a8c824e2fc7b37e38dee4af4538e9177a0ef5c9c6e408b83dffc56
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to external sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the PDF acts as a lure to a network of potentially compromised or malicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=best+mx+player+settings+for+firestick PDF link annotation
    • http://cattaneoarchitetti.it/userfiles/files/42196482806.pdfIn PDF document text
    • http://www.sctiec.com/up_files/FCK/file/nogojotetudoxaw.pdfIn PDF document text
    • http://newo.ru/files/files/90781549470.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/melopo.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/kakomi.pdfIn PDF document text
    • http://montazenabytkupraha.cz/files/file/wopifa.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/jatiroluxe.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/mokipari.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/xeveko.pdfIn PDF document text
    • http://aa-nusd.jp/migubarejufelezigepiwisi.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/13017894224.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/72908976126.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109121757005160.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137158957515---28398474475.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/90266248427.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/21180715209.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/54232023642.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/71777797359.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/makeputatasogar.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/duxarunatanozuduj.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/lulorumek.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_off0000f02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02F 11184 bytes
SHA-256: 5942f29347bfbdbfc90477b105e82f513489a2f23c21fa148a3c30deae499ca7
font_01_sfnt_off00010a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6B 21764 bytes
SHA-256: 6e0af162322192d68da8c9295964f9bb966b8a20ea7066d56bb4a20909ffa384
font_02_sfnt_off000143ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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