Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab68f61f7401872…

MALICIOUS

PDF

84.7 KB Created: 2021-09-18 00:30:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 126b1cd193bdc9898ec82b4f3f99481d SHA-1: 64889f349a90c5a95be4c468fa562891f4335aff SHA-256: 4ab68f61f74018727dad7d7c99bba209258f2afbae5dcafced06d5a9f27980c5
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The presence of embedded JavaScript and a fake CAPTCHA prompt suggests the document is designed to deceive the user into executing malicious code, likely to download a second-stage payload from one of the numerous embedded URLs. The document body itself is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the technical indicators.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://cructi.ru/uplcv?utm_term=lucky+patcher+mod+apk+no+root PDF link annotation
    • http://energo-market.ru/sadm_files/7594300235.pdfIn PDF document text
    • https://kultmotor.hu/images/files/wowuwise.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/cbn6v19ghnepbv7hkdmjgo7gh2/99330118651.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/gejodegiga.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/96922326516.pdfIn PDF document text
    • http://belean.pl/userfiles/file/puzogisanuxeva.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/famivolaraniwoxamizuvu.pdfIn PDF document text
    • https://qkon.ca/images/file/sukeruvasi.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/62948169824.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/16054389538.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109180607188857.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/lopolozugokatik.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/lafomanemafetade.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/289210618.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/tibowavegerurudidara.pdfIn PDF document text
    • http://orderkai.com/uploads/files/5422046884.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d814adc0d9---15929630215.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/rexazaziloniwubabib.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/kiwimasogelani.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/19220375527.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/nitivokedarobidijizogijo.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/xawobebagivodenajizoji.pdfIn PDF document text
    • http://anm-av.de/uploads/files/lonuxarelulavozulaperotop.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/jaxawezomima.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_off0000e15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF974 10736 bytes
SHA-256: 0e5bf42f6887fc0974409bc3f7874ff39f9cdba5f10a31bcbd59765b33d30e11
font_02_sfnt_off00011203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11203 19760 bytes
SHA-256: df0bedd6c8f282a064c054930544db959f8eeea67f0f8d5208c7a9687497256e