Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e1fceab5baa30d1…

MALICIOUS

PDF

71.5 KB Created: 2021-09-25 12:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3eedb6e15b7c322ab0bc5420bd1449d4 SHA-1: eddb6b903ef42b282e53247d7cff0f8545bd7b69 SHA-256: 2e1fceab5baa30d1af4998605710027953b38bc92bf49f6b507b438b5ea91859
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also functions as a link farm, directing users to numerous external PDF files hosted on various domains, suggesting a phishing or malware distribution attempt. The presence of JavaScript indicates potential for further malicious actions beyond simple redirection.

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
  • 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://mopi.eu/ckfinder/userfiles/files/23914088454.pdf In PDF document text
    • http://stylekd.ru/files/xebatofegirogopite.pdfIn PDF document text
    • https://dhrc.in/userfiles/file/81791607462.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/40441335145.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/vidunabas.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/nebibabejibaxewozikegila.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/kovuw.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/44964934930.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/rozoruxowufekezosibaber.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/45160008854.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/luvubu.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/nimewa.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/76675761686.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/vufuverekuxenojomi.pdfIn PDF document text
    • http://www.grifin.sk/files/figisipetoganolugetepigu.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/depomuli.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/35276711980.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/kamim.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/29395566317.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614da57046d90---tepisuzelodoxitezonat.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/lugupanubixalo.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/63019715847.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/77850477920.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/34098000005.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/wanenidirigegukevenu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=madflix+app+downloadPDF 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_off0000b557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB557 17340 bytes
SHA-256: 645f48a98fa8e5ae0d6d5ab166e2991a4a256775d120133f00aae5b1ce9bdff4
font_01_sfnt_off0000e17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17B 10172 bytes
SHA-256: c69fd42ce6e332bb358723d9929fe488c969e879518ace11ae2256ee920bef7d
font_02_sfnt_off0000f855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF855 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1