Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b52359bd2ca6d44…

MALICIOUS

PDF

103.5 KB Created: 2021-03-05 22:57:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4aeed34202f25cee411573c28277cdd6 SHA-1: d0d6be5cfaed07cffa0a74a0c6742e69caa10831 SHA-256: 0b52359bd2ca6d443823e1beb4bd9cb86224e13fe10f81f6122b27a04f292208
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to 'resalured.ru/strik'. Heuristics indicate this PDF is a link farm on disposable hosting, and ClamAV detected it as 'Pdf.Phishing.Trojan'. The ML classifier also flagged it with high confidence. The document body, though heavily obfuscated, contains text related to 'html5 canvas game tutorial for beginners', suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://resalured.ru/strik?utm_term=html5+canvas+game+tutorial+for+beginners PDF link annotation
    • http://narelarijejale.iblogger.org/aamir_khan_all_movie_songs_pagalworld.pdfIn PDF document text
    • https://cdn.sqhk.co/fudimesa/dhhz6BL/meow_button_sound_effect_kitten.pdfIn PDF document text
    • http://jobware.pro/dikesuxuvudotaseba97ltt.pdfIn PDF document text
    • https://cdn.sqhk.co/depadukat/figg6Ra/knives_out_streaming_platforms.pdfIn PDF document text
    • https://cdn.sqhk.co/jivazufevi/chajb6J/risuxefewumidibemadezazen.pdfIn PDF document text
    • http://uscreditreport.info/93690586736yhr9z.pdfIn PDF document text
    • http://marketes.pro/441031409840nei0.pdfIn PDF document text
    • http://airned.ru/rockers_full_movie_freehyfke.pdfIn PDF document text
    • http://naturapple.space/slackline_industries_aggro_line_reviewv7txa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://roraxekabitapoz.rf.gd/54646160325.pdfIn PDF document text
    • http://buzuxujov.epizy.com/dd_3.5_planar_shepherd_handbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db98751f-f837-41c8-91c0-caeb2abefd20/latagetuwib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd7e643a-daa0-414e-b0b8-8918a8785c84/tabla_de_equivalencias_pulgadas_y_milimetros.pdfIn PDF document text
    • http://rinotox.rf.gd/olympus_digital_recorder_vn-7200_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f3b13d1-b804-480e-a2e0-e7c1eca7fef7/26865280374.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0c88fc2-b253-4b48-9180-c31e6e813e12/how_much_do_automotive_technicians_make_at_a_dealership.pdfIn PDF document text
    • http://bopexetosezulav.rf.gd/pogekagimefawavo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0bf8c33-8436-4822-bc44-64fd97d16fcd/xojorofemebexukat.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_off00015624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15624 5484 bytes
SHA-256: dbfdb410782eb2715ed428c11a9f064f4fc96eb2850c715d7db1c781e7b797cc
font_01_sfnt_off000168c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168C3 11776 bytes
SHA-256: 539e1dce75945ac79bbf972eb377016f40f140ec7a7bf0cf2d936623ed5a0b5c

Open this report in the interactive analyzer, or submit your own file for analysis.