Malicious PDF — malware analysis report

Static analysis result for SHA-256 9338bf8fabe5f8d8…

MALICIOUS

PDF

85.2 KB Created: 2021-09-19 10:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 27e02f5a78ccef8e1b7b8b99764553dc SHA-1: 7ab341723da3e344817e847b57e96a6bbf399438 SHA-256: 9338bf8fabe5f8d805531ac8a36296207f66e6d9c4873ca6aae1caca3cd5e345
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous external links, suggesting it is designed to redirect users to malicious sites or download further payloads. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mastrodibaglio.it/userfiles/files/35075304466.pdf In PDF document text
    • http://abwingsjanaf.com/uploads/files/veluwekifeji.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/4f1f06de313ffdb090b544d793a937c6/2087809781.pdfIn PDF document text
    • https://diphong.com/uploads/sabozikopifojesamudu.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/bobetananojof.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/99167399936.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b78e5373d1---33407842981.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/31405083752.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/gawefebemerabobigadafedaw.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/39321567159.pdfIn PDF document text
    • http://ipai-bg.eu/img/file/46793078709.pdfIn PDF document text
    • http://jcpingie.be/public/files/7748792417.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/dikovegodanezoxep.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/vokovigawaxisiwadagife.pdfIn PDF document text
    • http://lawyersmarketingusa.com/user_upload_image/file/In PDF document text
    • http://psychologadamczak.pl/userfiles/file/80086490016.pdfIn PDF document text
    • https://izometal.net/mm/file/mufawopiku.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/kidiromoduxodamivijo.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/lewamodepavolemomed.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/23558041187.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/95365640927.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/33531036432.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/53371175924.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/zikelorexubatovito.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/xejokamevonina.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/79021048729.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=gift+wallet+mod+apk+unlimited+moneyPDF 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_off0000e0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AD 20200 bytes
SHA-256: 67578279dc5144eddf0a0d8589d67258f7675335c53aa3789aae3cefdd8e2885
font_01_sfnt_off0001158a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158A 10824 bytes
SHA-256: 3e002558bc029cff725122e85465ee36829c3b71ac02d6364c0d696af6b949a7
font_02_sfnt_off00012e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1