Malicious PDF — malware analysis report

Static analysis result for SHA-256 b334f73ed55ea9d5…

MALICIOUS

PDF

73.7 KB Created: 2021-10-15 01:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d27806927a936349bd252410d6f76960 SHA-1: 4a38bd644a24e816ba6aab5b3da3c5ce6ae310bb SHA-256: b334f73ed55ea9d5d8755317ce986ed847bb34a10cc4ad83f23598e10bc42b39
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, many of which appear to be disposable. The primary purpose seems to be to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161445a4f713de---bekazojo.pdf In PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/mimofumewun.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612ece51543be---41086353321.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/sotadumijilusudit.pdfIn PDF document text
    • https://schodyperfekt.pl/user_upload/file/19171525103.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/76016790324.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/161644f53119f7---15931885750.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/37798711256.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/96130331308.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/37562799936.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/4264796332.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/gamusutufovopugup.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/94488768785.pdfIn PDF document text
    • https://cv-vezouze.fr/media/file/2356605094.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/navazetadomikuxufuviwofa.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20211012210300.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/bubumesavenije.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/zikezifefegojopegewoxexob.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/20563946960.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/f66ff4bacc11694b1105446ee9306c94/vijesiz.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/bisiwaxigene.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/resenuribuwod.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/88402864138.pdfIn PDF document text
    • http://esipro.be/userfiles/file/60907610564.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/puderum.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/52155085873.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/5bhJmFgkeCE/uplcv?utm_term=k+means+clustering+time+seriesPDF 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_off0000bb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB82 17324 bytes
SHA-256: ea70522167928626dd3da353fabb2da8de5d186fc214f5ff874777fe5763d8ed
font_01_sfnt_off0000e8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A8 10544 bytes
SHA-256: 24332c335c3f6a6d11ff2f521fa108ff62d74a92ac814eaf7a4d47572bcf2190
font_02_sfnt_off000100a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1