Malicious PDF — malware analysis report

Static analysis result for SHA-256 273b4d15c97f3ab7…

MALICIOUS

PDF

70.4 KB Created: 2021-02-27 17:58:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2f12556f45bf2ac364fc6ef85cb0eac8 SHA-1: 979f9049ebae51b2b344fb63646fd1ef6748deeb SHA-256: 273b4d15c97f3ab709e9444772d2032a5f1e5fec9721a5ba179ba95dd47a9260
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, containing embedded URLs. One prominent URL, 'https://vilenefex.ru/wb?keyword=how%20to%20transfer%20a%20call%20to%20voicemail%20on%20nec%20phone', suggests a phishing or social engineering lure. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics indicate the document is designed to redirect the user to a malicious site, likely for further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/wb?keyword=how%20to%20transfer%20a%20call%20to%20voicemail%20on%20nec%20phone PDF link annotation
    • https://cdn.sqhk.co/vilitemeru/jgjgiHA/download_pug_my_virtual_pet_dog_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/zanemulazif/avggidb/program_4fun_tv_na_dzis.pdfIn PDF document text
    • https://cdn.sqhk.co/mawejoxejobe/XhiBcHk/captions_for_photoshoots_on_insta.pdfIn PDF document text
    • http://dayzcommunity.info/zombie_monster_truck_cartoonej6oz.pdfIn PDF document text
    • http://mumezofenina.22web.org/office_halloween_costume_contest_flyer_template.pdfIn PDF document text
    • https://cdn.sqhk.co/kitaparek/ibighj8/xaxebekaxenipepogimijuk.pdfIn PDF document text
    • https://cdn.sqhk.co/mixaluwekitu/Vgbw2hj/the_legend_of_sword_and_fairy_4_download.pdfIn PDF document text
    • https://cdn.sqhk.co/vopofuxo/cjifqid/vofalawiruj.pdfIn PDF document text
    • https://cdn.sqhk.co/matajikiwov/HqidShj/photo_editor_filters_and_effects_apk_mod.pdfIn PDF document text
    • http://findssldz.xyz/mastering_regular_expressions_by_jeffrey_friedla7a4o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jujalun.rf.gd/coventry_city_football_match_report.pdfIn PDF document text
    • http://pevudavef.rf.gd/amazing_grace_saxophone_sheet_music.pdfIn PDF document text
    • http://falalovoxiwada.epizy.com/graduate_training_plan_template.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_off0000d650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD650 5368 bytes
SHA-256: 3402818393336fc26a1090cb411caa15712b2e43fa6f08aead8dcd3247b74bb8
font_01_sfnt_off0000e881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE881 10508 bytes
SHA-256: 244c21550a15779681a51353919d4c5b51406faa6f093e93b40555f0f0f64f91