Malicious PDF — malware analysis report

Static analysis result for SHA-256 71dd31757cca46be…

MALICIOUS

PDF

99.4 KB Created: 2021-04-11 18:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c09b34fbe92e05cbd83cb3e5ee3caccf SHA-1: 5aff6a51dad6aa4370275168b2e2592292328f54 SHA-256: 71dd31757cca46be814cb6c95f7c5260ffe73facc7d424137223092a75e99803
134 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous external URIs, many pointing to disposable domains, suggesting a link farm designed to redirect users. One such URI, 'https://druttle.ru/strik?utm_term=what+is+einstein%2527s+theory+of+relativity+for+dummies', is particularly suspicious and likely leads to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://druttle.ru/strik?utm_term=what+is+einstein%2527s+theory+of+relativity+for+dummies PDF link annotation
    • http://watogoda.mypressonline.com/unidad_3_quimica_enlaces_quimicos.pdfIn PDF document text
    • http://kupivse.xyz/graphic_design_training_in_suratkl3ke.pdfIn PDF document text
    • http://effektzhizni.ru/symantec_blue_coat_reporterupo5a.pdfIn PDF document text
    • http://upgrade4me.com/what_is_physics_in_simple_wordsexa6x.pdfIn PDF document text
    • http://pogawubujogeje.mypressonline.com/wifawifipebirepo.pdfIn PDF document text
    • https://cdn.sqhk.co/moxulofilose/jchjIhh/dominos_coupons_near_me.pdfIn PDF document text
    • http://reduslimitalia-ufficiale.site/f_a_q_ka_full_form6ea3w.pdfIn PDF document text
    • http://goproits.com/does_allegiant_have_free_baggage_for_militaryqb6jf.pdfIn PDF document text
    • http://good-production11.site/monaziw3beh7.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/5249216131.pdfIn PDF document text
    • http://gekifek.scienceontheweb.net/the_reluctant_fundamentalist_chapter_1_quotes.pdfIn PDF document text
    • http://lumobumekola.getenjoyment.net/wu_tang_american_saga_season_1_episode_8_watch_online.pdfIn PDF document text
    • http://particulier-societegenerale.xyz/frequently_used_french_words_in_englishn06gl.pdfIn PDF document text
    • http://kapabifidi.sportsontheweb.net/intoxicacion_fenobarbital.pdfIn PDF document text
    • https://cdn.sqhk.co/toromerepowa/HVji1HL/segitejisejebarux.pdfIn PDF document text
    • http://trokot-newshop.online/cool_ringtones_for_android_2020156e4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://saxodanokijaj.atwebpages.com/53066813328.pdfIn PDF document text
    • https://11627308-8c8f-4f08-99ed-0ad85160907d.filesusr.com/ugd/682d1c_2cf194de9de643538726010d58397fee.pdf?index=trueIn PDF document text
    • https://3cd6846c-369c-4875-9c63-132df726a2dd.filesusr.com/ugd/7ab50f_8ea88655be2541eb9a6620a4438c3177.pdf?index=trueIn PDF document text
    • http://lojabupabavize.onlinewebshop.net/conjugaison_avoir_exercices.pdfIn PDF document text
    • https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_1d41e181c9444a0d9fd05f9a8a5bc283.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5F 15624 bytes
SHA-256: 9aab7d6e61dba11f74bed3137975b78e822be4f7d9101386aacebdda4ca19a81
font_01_sfnt_off00013177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13177 5356 bytes
SHA-256: fde5dc280f0e7b64f52a11d79d1e352e1fe894e830d64739f5a5d2c6cbe4ffa4
font_02_sfnt_off0001439f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1439F 11512 bytes
SHA-256: 98ca98c2822d2805162e993827c8a8bb91fd154ecd31c8f59a0b4ec1f4aaf619
font_03_sfnt_off00016aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AEF 16036 bytes
SHA-256: 354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb