Malicious PDF — malware analysis report

Static analysis result for SHA-256 02b842edea1da761…

MALICIOUS

PDF

87.6 KB Created: 2021-09-13 15:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a04f606bed053d2251d2538fbac3a299 SHA-1: 5dae1ac1df32307c30be9d5a6afbacec0cf4f2c3 SHA-256: 02b842edea1da76156c961e8a62a4417cc925726a05e8204abd7002bffda5c23
154 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a QR-code lure. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ficfart.org/userfiles/file/21292546666.pdf In PDF document text
    • http://elitsatodorova.com/uploadfiles/file/vinolu.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/fepuxagozatazobuzugowulux.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/porekikokovepo.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/42828978363.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/99125271006.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/mejolud.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/99310598537.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/rovaxibokurawuvilowewup.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613629e108e61---63083663362.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/wulinonidubeme.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/8459157760.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/42043106044.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/fosewofijusoganageb.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/molejotulemomigireji.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/3989235333.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/popuzine.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/woranofijib.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/67521342966.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/6416993832.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/pekixikamekebuv.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/70787184261.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/difiwupapokujonolilewa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=kinesthetic+learning+activities+for+readingPDF 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_off0000ecfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFC 10812 bytes
SHA-256: 7e72148f691d7062b92225d33e354920255e6a1a995b51173e9ae1693bf35d2c
font_01_sfnt_off000105ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AB 19396 bytes
SHA-256: f031f27d4f579d28ba53777346875d67eb4c6dcd2f55cc6344e3ceadb391c046
font_02_sfnt_off0001389b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1389B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1