Malicious PDF — malware analysis report

Static analysis result for SHA-256 5556c9fc139cfd66…

MALICIOUS

PDF

76.0 KB Created: 2021-06-07 00:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9f58f7bfdfe5985b4e3768b17c7208b0 SHA-1: 26608862bdd12c570db3c73a1038966ca5ea2415 SHA-256: 5556c9fc139cfd667dc9bbacc33790e2aaf22e1047d2ecd1d03b0733bbdae337
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 phishing malware. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm. The document body, though heavily obfuscated, suggests a lure related to historical events, likely to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://cructi.ru/pbw?utm_term=causes+and+results+of+the+russo+japanese+war+of+1904%25E2%2580%259305 PDF link annotation
    • https://deserekinubolid.weebly.com/uploads/1/3/4/3/134319780/2ce5394124b96d.pdfIn PDF document text
    • https://dijozigi.weebly.com/uploads/1/3/4/7/134748041/27446b9f.pdfIn PDF document text
    • https://zunazodofi.weebly.com/uploads/1/3/4/6/134636935/95a339f818.pdfIn PDF document text
    • https://gixoxiri.weebly.com/uploads/1/3/4/7/134707295/1045434.pdfIn PDF document text
    • https://lolivifi.weebly.com/uploads/1/3/0/7/130739590/doxulapapakopimuxo.pdfIn PDF document text
    • https://luxovozudenez.weebly.com/uploads/1/3/4/1/134108910/2c4728.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ruwomodanom.pbworks.com/w/file/fetch/144450768/hebrew_greek_key_word_study_bible_niv_black_key_word_study_bibles.pdfIn PDF document text
    • http://fotikeralo.pbworks.com/w/file/fetch/144444057/rejolimofotinubonulali.pdfIn PDF document text
    • http://kolelulu.pbworks.com/w/file/fetch/144417120/led_tv_service_manual_free_download.pdfIn PDF document text
    • http://zupelapowi.pbworks.com/w/file/fetch/144499428/spanish_preterite_tense_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/281361e3-ff70-4cd4-a047-441ab6b3bde8/jekub.pdfIn PDF document text
    • http://piwazufoli.pbworks.com/f/factors_and_multiples_worksheet_for_grade_5_with_answers.pdfIn PDF document text
    • http://pokuwatosat.pbworks.com/w/file/fetch/144457188/56624669859.pdfIn PDF document text
    • http://dumunivuniv.pbworks.com/w/file/fetch/144676461/how_to_become_a_tour_guide_abroad.pdfIn PDF document text
    • http://funuvutidip.pbworks.com/w/file/fetch/144626586/pikudugapitagorekolewuli.pdfIn PDF document text
    • http://wiwedano.pbworks.com/f/how_to_value_charizard_pokemon_card.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c197099-3b4a-4ae1-880d-0128ba379e0d/how_did_railroads_impact_the_west.pdfIn PDF document text
    • http://vifogajo.pbworks.com/f/how_to_get_mihaly_skin_ace_combat_7.pdfIn PDF document text
    • http://foziwedugumu.pbworks.com/f/77776924454.pdfIn PDF document text
    • http://visetululiv.pbworks.com/w/file/fetch/144416721/captive_minecraft_map_1.15.2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ecdf980-872a-497c-a562-3d56f8c94f67/zapovekovusuzufotemafifo.pdfIn PDF document text
    • http://zusemivak.pbworks.com/f/apple_iphone_ringtone_download_mp3_mobcup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/730132e9-6a9f-4447-8db1-d9bb6d76025a/walmart_pharmacy_fitzgerald_ga.pdfIn PDF document text
    • http://zowonixepor.pbworks.com/f/11304433096.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_off0000e7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C1 5796 bytes
SHA-256: a67d181bd00f91f3fd3bb71614f8d5495a06efe806d1000b02b15839d6731bfb
font_01_sfnt_off0000fb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB99 10656 bytes
SHA-256: ec8ef54ef9f7cb12b6609ebfbb85b4707acf07d503a5e280f8309cb4745d49da