Malicious PDF — malware analysis report

Static analysis result for SHA-256 3146a0a842ac7aaa…

MALICIOUS

PDF

87.1 KB Created: 2021-03-22 19:48:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3ca5f1c1ac1805d42d832f95e1bc9f5e SHA-1: b23216047051d5bee534af00e78fd2cb4daa45e5 SHA-256: 3146a0a842ac7aaa4a014ee9d6d8ae0b473bde55d601deeb9540595fa41642dd
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 external URIs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, but the primary malicious intent appears to be the redirection to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/award?keyword=maltrato+psicologico+pareja+pdf PDF link annotation
    • http://mosuxuvemuzuwex.mywebcommunity.org/raxakolugudulefuza.pdfIn PDF document text
    • http://posebakuxosafod.getenjoyment.net/mujenog.pdfIn PDF document text
    • https://rajotabew.weebly.com/uploads/1/3/4/3/134360909/bifabuliral_patedat_wevawotulex_tekolilazem.pdfIn PDF document text
    • https://cdn.sqhk.co/rajemaramiw/hggf7Cg/download_driving_zone_2_mod_apk_android_1.pdfIn PDF document text
    • https://rozutawupev.weebly.com/uploads/1/3/2/6/132695629/rorilezijaxiged-teduwewa-muwosoxuduba-rosofomud.pdfIn PDF document text
    • http://verezitabel.66ghz.com/bajaj_handloom_bed_sheets.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/85322559426.pdfIn PDF document text
    • https://cdn.sqhk.co/fosapuzisas/ifhj6gi/convert_between_metric_units_worksheet.pdfIn PDF document text
    • http://novofikupeneda.mywebcommunity.org/brahm_kavach_meaning_in_punjabi.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/suzixegazunow/rokakirovi.pdfIn PDF document text
    • http://nabenejajoko.myartsonline.com/raxoselewubitim.pdfIn PDF document text
    • http://faxiruvud.myartsonline.com/company_of_heroes_2_mac_trainer.pdfIn PDF document text
    • http://xurosuforudev.atwebpages.com/bruins_schedule_2020.pdfIn PDF document text
    • http://siwemoxoxawevuv.atwebpages.com/satuvapanotafotilovazari.pdfIn PDF document text
    • http://jobifizokugo.rf.gd/c_manualresetevent_waitone_example.pdfIn PDF document text
    • http://mejesikiwabez.epizy.com/how_do_i_update_my_sound_drivers_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/elcon_charger_datasheet.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_off00011356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11356 5404 bytes
SHA-256: b2864ae2611e199ca812bd19c2e8b2e5238707ed1bb70991660e5f2c22fc3408
font_01_sfnt_off000125d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D7 12288 bytes
SHA-256: 7a986d520863a5701aa7b6dec0861213918e38a1e98530902d82cbdd2f190576

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