Malicious PDF — malware analysis report

Static analysis result for SHA-256 889cee4cac81ff1d…

MALICIOUS

PDF

83.3 KB Created: 2021-03-12 05:59:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0543272376e3a89be817025d1feccb4f SHA-1: 5bf39579e6f90e0ba797eada119cd8d99ec79866 SHA-256: 889cee4cac81ff1d0770c0fe4d9fc01357fb7520eec99ee694aef0e80030c019
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with one pointing to 'bologen.ru' which is associated with a lure about a '2016 cadillac ats manual review'. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, suggesting a phishing or scam attempt. No scripts were extracted, but the presence of external URIs and the overall detection suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=2016+cadillac+ats+manual+review PDF link annotation
    • http://spiritstudio.ru/784437440641swd7.pdfIn PDF document text
    • http://iwhite.space/684436001654ggtc.pdfIn PDF document text
    • https://cdn.sqhk.co/gasupewu/wJgdhar/tekken_7_new_characters_season_3.pdfIn PDF document text
    • https://cdn.sqhk.co/xiladuxe/jgfhd0K/55215069573.pdfIn PDF document text
    • http://idealslim-ordina.site/beclometasone_dipropionate_formoterol_fumarate_and_glycopyrronium2e4t4.pdfIn PDF document text
    • http://tiktokcopyrighthelpteam.com/how_to_clear_filter_on_honeywell_thermostat42d60.pdfIn PDF document text
    • http://natur-bio.space/zapewidituwulokawxnvti.pdfIn PDF document text
    • http://help-service-support.com/gafigijelagigenaf6n85u.pdfIn PDF document text
    • http://discount50.pro/gegasapvno1.pdfIn PDF document text
    • https://cdn.sqhk.co/foligezuli/3gihcie/clash_royale_hack_private_server_apk_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/be52f539-2f60-436d-971a-d898278844f5/samsung_un40eh5300f_remove_stand.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f973ac8-a831-4ccb-b428-e06efbcee7c3/45405541867.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14a86691-39bb-48b2-873a-490fa3c8aa64/how_to_use_acrobat_pro_dc_helpx.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/828cc139-535d-4cf2-ae93-5ca12473ca4a/post_office_account_number_digits.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/565a0c1c-eb72-47d3-92c7-9f909f2ab492/68228816117.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17cbb6c3-fef3-4c44-b2a2-44b9195da238/safety_1st_winnie_the_pooh_walker_height_adjustment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/625fb4ef-bdcd-411b-879d-26882f82f6d8/18257081729.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/815d67bc-8a2a-4188-b4dc-d45491c4ed7f/what_are_cycles_in_a_washing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/508fef1a-f5ef-49a8-ac36-800221f768ab/80581304987.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05bc66b4-a264-4cba-ba96-2ac534cf15ae/48282664371.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE8 5396 bytes
SHA-256: 2da69cee5e1053d25ceb47997fbc0fb89eab8953c925a9ab402a524931b42c82
font_01_sfnt_off00010e22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E22 10596 bytes
SHA-256: dad3e547a19c634b22382350829cc7a2e26ba9ded611fad2110d7dd7ce7ed21b
font_02_sfnt_off0001321c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321C 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333