Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2c1950e951d40a0…

MALICIOUS

PDF

96.8 KB Created: 2021-09-21 04:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e6e9bbe588f5cf1cc6c61e292b589491 SHA-1: 0f4bf7f7fbb488f92f881e7a0f4900e72de7e2f3 SHA-256: d2c1950e951d40a03fd7b00fb6f8aede23592ca91842dd467dc8f1a12e46bf74
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect users to potentially harmful websites. The PDF's structure and the presence of many links suggest it is part of a link farm designed to obscure the true destination or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • 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.
  • 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=how+do+i+move+apps+on+my+android+phone+to+my+sd+card PDF link annotation
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1613baee54b1d5---dopoduxuvogozuba.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/74405970350.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/77203794483.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/wedipiwerusoxoxo.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/54179309606.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/rixubowop.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/suvopebowid.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/10111819299.pdfIn PDF document text
    • http://jfe.hk/userfiles/18660736474.pdfIn PDF document text
    • https://digireg.li/upload/solipiti.pdfIn PDF document text
    • https://12shio3.com/contents/files/fukudosibesu.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/gowororor.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/99185855011.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/razaxinivefodemazetuju.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16140c88f8f040---vulegakapozirenivas.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/41539745988.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/dewibulevevad.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/52512109777.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/61252448642.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/62776434719.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/zewulegetadabalej.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/1470914407.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/8995701839.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_off000113fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FA 18400 bytes
SHA-256: d4aec0f414d13e5c9703067d91be08a6bedd3afa9f9ac40239a0d5fc0f26430f
font_01_sfnt_off00014355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14355 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B6C 10988 bytes
SHA-256: bad868ad43def4e3f9554994b4dcc2e0f65a83a4124191b359bb82351bb5a1f9