Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa987a01baf2241…

MALICIOUS

PDF

81.6 KB Created: 2021-09-19 12:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8546d41a4ce09b215a775ab901799cfe SHA-1: c051fc8a7fa40f7beda1ab0372300e32038d2ec9 SHA-256: 3aa987a01baf22418c6672258b0f3b090823a2d2d29fe0430131ee495a4c3a41
174 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to interact with external resources. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document's purpose is to trick the user into installing malicious software disguised as a browser update or extension. The embedded JavaScript likely facilitates this by driving the user interaction or downloading further malicious content.

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://atputasbazes.lv/images/userfiles/files/gidurusivuf.pdf In PDF document text
    • http://forglass.sk/userfiles/file/wusenikikukuxigoje.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/67650980049.pdfIn PDF document text
    • https://xn--80aggmy8c6c.net/UserFiles/File/13655279526.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/15334725607.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/62d1723234e776d8850d5f3adde58cae/32361515796.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/vunobo.pdfIn PDF document text
    • http://thongthien.vn/upload/files/xulonikosagapuxida.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/pojemipanitalufikuleva.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/vapotolujorafi.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/19863090967.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/70396708422.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/65232509782.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/49095372208.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/57830639846.pdfIn PDF document text
    • http://liluby.com/upload/file/67910098648.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/zujuxojo.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/zogafanejojode.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/titomaxubakuzatimegug.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/56359671364.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/65686829016.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/xuveduwuvajuxovuwogasewot.pdfIn PDF document text
    • http://systempro.kr/userData/board/file/54916453385.pdfIn PDF document text
    • http://tianfonmm.com/d/files/rowexor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=adobe+creative+cloud+sign+inPDF 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_off0000d92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13D 17828 bytes
SHA-256: b28b184db5fbdfd47eac7e835b94bd1c98143b1feff0ba4990f3a3d3f11a5fd0
font_02_sfnt_off00011fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBA 10832 bytes
SHA-256: c09fc1023f609fe1f0e92bd1ce0cad518b1c9369597c0c309b49d4698ea131f8