Malicious PDF — malware analysis report

Static analysis result for SHA-256 73f4f89c7f417745…

MALICIOUS

PDF

70.0 KB Created: 2021-02-17 20:24:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 37fc94ac6c499e91d518110a7a44ad62 SHA-1: f3d3390296de59daa167c1e806bedef3941bb6e1 SHA-256: 73f4f89c7f4177454699da095f2b416743b2fcfbbe4f0fcd73ddb7de920fbd70
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/strik?utm_term=tecumseh+ohh60+gas+tank PDF link annotation
    • http://instapriz.website/54720539337u1xli.pdfIn PDF document text
    • https://cdn.sqhk.co/pubodegosog/hh40jdM/ticket_to_ride_europe_game_board.pdfIn PDF document text
    • http://yesitalia.fun/fegexuwepawukibojetawtqf.pdfIn PDF document text
    • https://cdn.sqhk.co/vedasukuki/jdiiehg/mens_short_haircuts_2020_thick_hair.pdfIn PDF document text
    • http://detonic-buy.website/allu_arjun_photos_djna2yh.pdfIn PDF document text
    • http://private-channel.site/gateway_b1_test_answers_unit_5ezll3.pdfIn PDF document text
    • https://cdn.sqhk.co/kusamika/jjdMihd/ronabegodupega.pdfIn PDF document text
    • http://grenkasalo4.xyz/wibr_apk_new_versionl5th5.pdfIn PDF document text
    • http://fallofelin.online/232592920kt27w.pdfIn PDF document text
    • http://sakhavto.ru/vuwunugepokimidukisibofcjfus.pdfIn PDF document text
    • https://cdn.sqhk.co/tejurorado/jiLtQLR/wwe_rumors_and_spoilers_raw.pdfIn PDF document text
    • http://criticcxck.space/xujorujusinulosobipevolo0n8ar.pdfIn PDF document text
    • http://pakewiw.iblogger.org/9966105023.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
    • http://zudajuwi.epizy.com/jar_to_java_archive_tool.pdfIn PDF document text
    • http://gugamofizuxeg.epizy.com/cbse_10th_result_2019.pdfIn PDF document text
    • http://siwapog.epizy.com/remington_700_bdl_front_action_screw.pdfIn PDF document text
    • http://puwagof.rf.gd/letter_d_worksheets_free_printables.pdfIn PDF document text
    • http://visobiwedixupip.rf.gd/florence_tv_reporter.pdfIn PDF document text
    • http://wuzuvulas.epizy.com/bluetooth_for_pc_offline_installer.pdfIn PDF document text
    • http://mesapobifutu.rf.gd/kinetic_typography_free_template_after_effects.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_off0000c7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F2 5228 bytes
SHA-256: 2e55f28a2e17801b0f7cd274e0c1b9ca301314d94275fbf6f2a6f57b0fb5626d
font_01_sfnt_off0000d997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD997 10276 bytes
SHA-256: f70f2a68754202e922b79fe95476f36b6e550ce1572eadb93019188419f90bfd
font_02_sfnt_off0000fce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE5 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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