Malicious PDF — malware analysis report

Static analysis result for SHA-256 82724392fb5de732…

MALICIOUS

PDF

75.9 KB Created: 2021-04-09 11:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5df56124444535407dad17c0a021df9a SHA-1: 1dd085a1f9970b6d7f7b4cb52b8140b3ee03a86e SHA-256: 82724392fb5de732388d79b2e0ce7bdab81f505a51ebd79dd1fc8e0fa6bb6ef8
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'https://bologen.ru/strik?utm_term=tokyo+ghoul+manga+buy+online', suggesting a phishing lure related to manga purchases. The document body, though heavily obfuscated, contains text related to the search term, reinforcing the phishing pretext.

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://bologen.ru/strik?utm_term=tokyo+ghoul+manga+buy+online
    • http://muvajopumo.22web.org/infomercial_template_videohive.pdf
    • http://sutiwejepeb.22web.org/azure_devops_pipeline_yaml_template.pdf
    • https://cdn.sqhk.co/zebapomiz/bStPHia/pathogenesis_of_atherosclerosis_amboss.pdf
    • http://nupubidodeje.22web.org/how_to_see_a_doctor_in_spain_on_holiday.pdf
    • https://cdn.sqhk.co/dabizogi/WcjgspI/32114157465.pdf
    • https://cdn.sqhk.co/xasexuwosul/XieyclS/76108497877.pdf
    • https://cdn.sqhk.co/xifinelire/D3oUjhN/qr_barcode_scanner_app_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mepusafufeja.rf.gd/nikon_camera_d3200_user_manual.pdf
    • https://uploads.strikinglycdn.com/files/b1fd6fcf-3bf2-47ac-8727-db0c2b5b0b78/para_que_te_sirve_la_vitamina_e_en_la_cara.pdf
    • https://uploads.strikinglycdn.com/files/bf8d2517-c076-4aed-9779-ea30fe376bc9/41706884259.pdf
    • https://s3.amazonaws.com/mukutud/how_to_scan_using_hp_8600.pdf
    • https://s3.amazonaws.com/ginutu/touch_math_addition_worksheets.pdf
    • https://s3.amazonaws.com/tobaziw/cabal_mobile_english_version.pdf
    • https://s3.amazonaws.com/rokuwapesu/vancouver_self_guided_brewery_tour.pdf
    • http://lanikudawojag.rf.gd/88470034783.pdf
    • https://s3.amazonaws.com/simujix/bowirofaku.pdf
    • http://lurosanonit.epizy.com/7540560012.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db1e.bin
470617f03e3ed8d345b3fae4e866ee573f19cc6571c8545145688d0607575743		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1E 5020 bytes
font_01_sfnt_off0000ec7a.bin
92a809843cbf764a2624603e46ba65e55e8a498534c80cdf4c3fff0342ab06f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7A 5080 bytes
font_02_sfnt_off0000fdac.bin
c8714ef204285c7b87de2ebfaaf8363bb0c22f49565fbeda288113a9be44a3f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAC 10372 bytes

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