Malicious PDF — malware analysis report

Static analysis result for SHA-256 51624dfde1d465a0…

MALICIOUS

PDF

82.8 KB Created: 2021-05-10 01:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c0e11d1148ac82c0438b1dfa4c3f1024 SHA-1: 6c684afa27ece42157cca95aecedd929ee97fa66 SHA-256: 51624dfde1d465a066b1cf2bf13fa30b3a633033763ec6d382215174e547b177
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The document contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or redirection scheme. The primary URL, https://jacksth.ru/strik, appears to be part of a lure related to common search queries, likely leading to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://jacksth.ru/strik?utm_term=how+do+i+reset+my+lg+sound+bar+bluetooth PDF link annotation
    • https://cdn.sqhk.co/vewukiziwemi/jgogjif/77010282515.pdfIn PDF document text
    • https://cdn.sqhk.co/mitajaso/7gj8BvM/bed_wars_game.pdfIn PDF document text
    • http://vodaxuf.iblogger.org/apache_tomcat_6._0._29_error_report.pdfIn PDF document text
    • https://cdn.sqhk.co/lupobikud/KihU1jf/codelite_change_compiler.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406514/normal_601990158300f.pdfIn PDF document text
    • https://cdn.sqhk.co/pisapaxosabo/cppih7O/72777237917.pdfIn PDF document text
    • https://cdn.sqhk.co/kimejijomaki/hjcicGf/41704673382.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/jfLBNyb/21473772776.pdfIn PDF document text
    • https://cdn.sqhk.co/sixitigoxeto/iJiaVgW/angularjs_template_free.pdfIn PDF document text
    • https://cdn.sqhk.co/vudupapuj/wjhAjbk/go_legacy_dunes.pdfIn PDF document text
    • http://mileliz.iblogger.org/how_to_use_garmin_etrex_10_worldwide_handheld_gps_navigator.pdfIn PDF document text
    • https://cdn.sqhk.co/guzufaseba/5eifiiw/boba_tea_near_me_hiring.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/1gjukjc/free_printable_kitten_birthday_cards_for_son.pdfIn PDF document text
    • https://cdn.sqhk.co/sofilita/jgggcgf/among_us_free_play.pdfIn PDF document text
    • https://cdn.sqhk.co/busumodofu/fgtgeig/rexapu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459914/normal_5ff0d8cc3418f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411489/normal_602c092320d13.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/hbibhgc/87528995614.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468572/normal_5fdc965519904.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461744/normal_6061bcfaa8816.pdfIn PDF document text
    • https://cdn.sqhk.co/pumibavi/mhfxOja/puwesezodovedijajen.pdfIn PDF document text
    • https://cdn.sqhk.co/wezufunin/eFIQhgE/wunanipepazomutibo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fovemotalulefil.rf.gd/fedex_track_package_phone_number.pdfIn PDF document text
    • http://suzaxefewisuvek.rf.gd/52608471142.pdfIn PDF document text
    • http://mevusajilitum.rf.gd/angaar_bengali_movie_hd.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10735 5532 bytes
SHA-256: 478d18e51e196b46cdbf21a4f6c912fdab86904535ae95a9af0072e64183975a
font_01_sfnt_off000119e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E7 10472 bytes
SHA-256: 2310f69dd15061035c17a6fd9fa76289ff4cbc623fd063f4743165eeb4e8889b

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