Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2cf3762a95e4ea1…

MALICIOUS

PDF

86.3 KB Created: 2021-09-19 17:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: af2fc6c9033f772bb90b14720f1779a2 SHA-1: 90bd9ca53d78641bb5f35b424703575120eb2129 SHA-256: a2cf3762a95e4ea10719c1e577f9329331eff617e8b62425f5497834ed435703
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 malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests a social engineering tactic to trick the user into installing malicious software or extensions. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://prabashproperties.com/ckfinder/userfiles/files/nalofemirazod.pdf In PDF document text
    • http://tantusmarina.com/UserFiles/file/68954597925.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/82821885619.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/25217914012.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/85776901770.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/mokonipipelomep.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/5852981052.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/20144538051.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/77378940273.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/72964247042.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/tewaxobilimiturik.pdfIn PDF document text
    • http://lovesenergy.nl/file/88879262768.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/vozix.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/nafud.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/98971446965.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/zodukerafowotek.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/weveliwufulozoginogaku.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/76455755466.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/66175945279.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=android+chrome+cannot+open+pdfPDF 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_off0000ed18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED18 10652 bytes
SHA-256: df782ca1a70420a387cbdc76e2e2a86d44a66b991759a1a6a9ad7726565332d9
font_01_sfnt_off00010548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10548 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5A 17960 bytes
SHA-256: c31ebb2fec0ce8c41c66b8414e688510fd7b5897d5731253bcfc0a91b0e32d63

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