Malicious PDF — malware analysis report

Static analysis result for SHA-256 4352811cbc14aff4…

MALICIOUS

PDF

87.6 KB Created: 2021-04-12 20:41:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6315fb849f434ad0fe7e4a4ee53957eb SHA-1: 6a78f6d1c8a6f24bfd962ca543114f83096a1738 SHA-256: 4352811cbc14aff4778fb59a5c4315f5543cff7bf3438942da23aff58981901b
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 configured as a link farm, a common tactic for distributing malware or phishing content. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://vilenefex.ru/strik?utm_term=libro+lord+of+chaos+en+espa%25C3%25B1ol+pdf PDF link annotation
    • https://ximofutaxa.weebly.com/uploads/1/3/4/6/134626718/3ca3391091e038f.pdfIn PDF document text
    • http://xifadezuzurap.medianewsonline.com/73169531595.pdfIn PDF document text
    • https://bolumuratojepo.weebly.com/uploads/1/3/4/7/134749128/79c33b5.pdfIn PDF document text
    • http://bajifepeselok.sportsontheweb.net/xurulukunis.pdfIn PDF document text
    • http://senteber.site/anhalteweg_reaktionsweg_formely8wb0.pdfIn PDF document text
    • http://lebuvowune.getenjoyment.net/addison_disease_2020.pdfIn PDF document text
    • http://mamajan.space/10204462150xpdlm.pdfIn PDF document text
    • https://tigelulipuneve.weebly.com/uploads/1/3/4/7/134746657/ca7a1.pdfIn PDF document text
    • http://xofofumireke.mypressonline.com/best_dog_lick_pad.pdfIn PDF document text
    • http://mignonette.space/times_reporter_all_star_game_2018gytgr.pdfIn PDF document text
    • http://rebibedo.mywebcommunity.org/25305184951.pdfIn PDF document text
    • http://raicen.com/75478677375jo9we.pdfIn PDF document text
    • http://desokore.medianewsonline.com/harry_potter_and_the_philosophers_stone_film_length.pdfIn PDF document text
    • https://vunorozixu.weebly.com/uploads/1/3/1/1/131163876/6655040.pdfIn PDF document text
    • http://ig-mediateam.net/36998244300ucrx2.pdfIn PDF document text
    • http://kakorixow.mygamesonline.org/business_intelligence_ebook.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/b62c4cf9-9268-45b0-8810-dabf7843f94c/83799904080.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b857b5f6-6a36-4c2c-9513-48410e73f6c3/nunepuwixovezaradeleref.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7cd3e0a-7670-4d56-95a9-2d5b79275ea7/fifty_shades_freed_music_mp3_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f5098ce-c0ec-46a2-af5a-44110d9246fb/2012_highlander_liftgate_problems.pdfIn PDF document text
    • http://taroveruwidiba.onlinewebshop.net/modern_calligraphy_alphabet.pdfIn PDF document text
    • http://bilisedutave.myartsonline.com/2401778156.pdfIn PDF document text
    • http://fepetixapokurob.myartsonline.com/bihar_tet_question_paper_2020_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e758cf00-2bcb-4cdb-9609-1c5a09f3a28f/tri_tronics_classic_70_g2_transmitter_battery.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F1 5244 bytes
SHA-256: 635cf03e76cfc9bb3d24835dc949000ca2023079c0a8a079e2ed04ad902f6e2a
font_01_sfnt_off0001035a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035A 12228 bytes
SHA-256: 4a56b9f4721bcf09ddb79472cac19ff8d3bcf4f240f87fa992791d186d0caa37
font_02_sfnt_off00012b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1B 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e
font_03_sfnt_off0001404b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1404B 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34