Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d65ee467ce3628d…

MALICIOUS

PDF

76.8 KB Created: 2021-09-20 12:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f74aa74e58efeca789643a2f5a078e45 SHA-1: b0a88f011522b730098442e92470e7cb09f155b7 SHA-256: 7d65ee467ce3628d5efd56101472865f18e91203828b58566e75e6e065e7505a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to disposable hosting, and exhibits characteristics of a link farm. The presence of a 'download button' heuristic further suggests a lure to download malicious content. While no scripts were explicitly extracted, the PDF structure and external links indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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 https://catamma.ru/uplcv?utm_term=cs+go+for+android PDF link annotation
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/xisefebakatudikukozakol.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/bilobibajazad.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/serusodumopan.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/duwidotalututilixedusexax.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/wezuwirududedenamoledetif.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/digezegosobimafilagud.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/29824655555.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/koxetekefixafokigemuwi.pdfIn PDF document text
    • https://aedwea.com/upload/foto/5935725766.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/3327484178.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/42346247515.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210908_FF4944CAF9735085.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/16473526796147f75b72da4.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/96632709230.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338da843c7c---32014372953.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/61366363288.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3bd90d07c---57796728527.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/89589699436.pdfIn PDF document text
    • http://syekp.gr/sites/default/files/file/kusos.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/wamolujiferanelurol.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/71621488471.pdfIn PDF document text
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/30070766458.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_off0000caa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA0 17248 bytes
SHA-256: 38e0a00d70b9d67ec1495935a7d1fa168c9f58171a9d3fe70cd14c33b6ac9a8c
font_01_sfnt_off0000f6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF5 10284 bytes
SHA-256: a3bc1b0286864b6710874d9e1a1275f7a9656de662c0205e550a605a33b42333