Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bfe30462537c76f…

MALICIOUS

PDF

80.9 KB Created: 2021-09-10 04:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 21c5e50625e180931364800aba744e96 SHA-1: 6a4d4bfdabd6b61fed4e1413f9b51fa8d68b62e6 SHA-256: 7bfe30462537c76f2371e59af550d59d5b74655919a6f46dab66902d31079d3a
166 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document employs a social-engineering lure, instructing the user to install a browser extension or update to view content. This is a common tactic to facilitate the download of further malicious payloads or to steal credentials. The numerous external links suggest a link farm used for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=videoder+free+apk+download PDF link annotation
    • https://suncables.co/images/file/17970226730.pdfIn PDF document text
    • http://airmon.hu/images/files/jopupoxiluweb.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a588ef717---94563079241.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/fejuzepixi.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/88888426370.pdfIn PDF document text
    • http://dichvuhappyhouse.com/upload/files/tiwidakumujikigaxotas.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/guwarezofa.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/16296834733.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/24660213566.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/wuxonuzamefofetarijodu.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/ganemegibinobabolazus.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/68801818968.pdfIn PDF document text
    • http://oldstat.ww.tj/img/file/22413298705.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/49142860638.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202109092247447444.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210902_151425.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/kojalati.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/tubevefasidoriwixezivo.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/gedolivesaguwin.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-7/20210907184400412420.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_02_21_19_52_5955.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/bunakasixopikulixenexip.pdfIn PDF document text
    • https://akvaguru.hu/user/file/98393563720.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/65857906751.pdfIn PDF document text
    • http://balalajka.nu/media/nejakesagepinosovupifum.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_off0000da0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF221 17132 bytes
SHA-256: e05b5e28b4cc7f04035a302807ae1094528cd91cf3100416558d4def02936564
font_02_sfnt_off00011e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2E 10372 bytes
SHA-256: 20b835dd02e041b6a55b85c6c104b90302ab630e095e51339b9d8732a62c522b