Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c05e61c631f506…

MALICIOUS

PDF

72.2 KB Created: 2021-04-23 22:37:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0c1962b9d439f0d0385a78c07b70bca9 SHA-1: 7c69c7a1deb7aaa14565e87072fae4ceb7c6e015 SHA-256: b3c05e61c631f506b908663deebf7fddea05c57228bc1374684e8fa744eba119
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least one pointing to a disposable hosting domain and utilizing UTM parameters, indicative of a link farm designed to redirect users to malicious sites. The presence of external URIs and the overall structure suggest an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://lozipotod.ru/strik?utm_term=hi+point+9mm+carbine+collapsible+stock PDF link annotation
    • https://galixasuja.weebly.com/uploads/1/3/4/5/134518214/ridox.pdfIn PDF document text
    • https://cdn.sqhk.co/dabekojov/jjhp0hf/hero_wars_mobile.pdfIn PDF document text
    • https://vugalemudapitos.weebly.com/uploads/1/3/1/1/131164275/8669489.pdfIn PDF document text
    • https://vofagutozotu.weebly.com/uploads/1/3/4/3/134337458/b0913c.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvaratuji/0YigcUx/veledej.pdfIn PDF document text
    • http://mibenovapus.22web.org/whats_the_temperature_outside_right_now_in_wichita_kansas.pdfIn PDF document text
    • https://cdn.sqhk.co/nomelafu/yyjiUzM/balance_sheet_reconciliation_best_practice.pdfIn PDF document text
    • https://cdn.sqhk.co/kagitenoru/ibslPDX/wivuluxoteresawijexedul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/sheet_music_careless_whisper_saxophone.pdfIn PDF document text
    • http://vakewexapenox.epizy.com/angry_birds_rio_apk_mod_hack.pdfIn PDF document text
    • http://xoxadexol.rf.gd/fajobemorizibipexiruxe.pdfIn PDF document text
    • http://pifotojejanuwal.rf.gd/carrageenan_properties.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7690884f-19b6-4d3b-af0b-5c52097f5b2d/what_is_the_summary_of_harry_potter.pdfIn PDF document text
    • http://vunojagona.rf.gd/cultura_brasileira_alfredo_bosi.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/tp-link_wireless_n_router_wr841n_bridge_mode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a50ac90-5c63-4841-a5b6-b637745fd6db/stanley_fatmax_power_station_jump_starter.pdfIn PDF document text
    • http://wadusobu.rf.gd/58254524930.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/xefobu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d9c0134-0e39-4621-a4b8-6466564e457d/five_nights_at_freddys_vr_gamestop.pdfIn PDF document text
    • http://kufelinal.rf.gd/mamufudisa.pdfIn PDF document text
    • http://gopogawamo.rf.gd/2020_calendar_template_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b98de24d-0043-4c59-9cf1-3f2e2ed883e2/bissell_power_steamer_1631_manual.pdfIn PDF document text
    • http://sewegijod.rf.gd/lofikufamivugeximif.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_off0000d9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E7 5400 bytes
SHA-256: e7c61fec1559d4676abaa6604cd1a3341912eec4243d84f34a88af8b2b23405a
font_01_sfnt_off0000ec24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC24 11368 bytes
SHA-256: d1bf4c7f3df23d2002c1f7571e89e15ca23cfaddd01b04b676567b9885d00ffa

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