Malicious PDF — malware analysis report

Static analysis result for SHA-256 1efd36a434720bbf…

MALICIOUS

PDF

79.0 KB Created: 2021-03-29 03:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3b7f83db000a3cbe3bda37c0b5dae7dc SHA-1: 9c79d01fa2ed9d61aa5b302e53e7c910c740e2d6 SHA-256: 1efd36a434720bbfb4a2de4d967aac8d06e712fb4f7fe621334f34f741b12545
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://gimoguvi.ru/strik?utm_term=phrasal+verbs+examples+with+meanings+pdf PDF link annotation
    • http://idealica-official.website/cricut_joy_user_manual07e7v.pdfIn PDF document text
    • http://interbank.link/interceptor_missile_meaning_in_bengalim9o9b.pdfIn PDF document text
    • http://mebets.xyz/mortal_engines_book_series_reading_orderpb3a6.pdfIn PDF document text
    • https://lanapovo.weebly.com/uploads/1/3/1/4/131437145/9d045b.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://cdn.sqhk.co/kopilixa/j4niaii/bird_life_3_unblocked.pdfIn PDF document text
    • http://smcjd.com/hp_officejet_pro_l7680_ink_cartridgesatd7t.pdfIn PDF document text
    • http://pasetbs.xyz/mitutawoxefinafadaloguginmf.pdfIn PDF document text
    • http://brightshopbg.xyz/jipogurupeyiubr.pdfIn PDF document text
    • http://upsbox.ru/el_alquimista_de_paulo_coelho_librop06dz.pdfIn PDF document text
    • http://temppicture.xyz/nilabopisscewm.pdfIn PDF document text
    • http://sberbank.link/merapugfo1a7.pdfIn PDF document text
    • https://sogifeni.weebly.com/uploads/1/3/2/7/132712483/mamoseduvigabatalafo.pdfIn PDF document text
    • http://rbqjkwklnd.xyz/25278143836q5741.pdfIn PDF document text
    • https://tumokisomagen.weebly.com/uploads/1/3/4/8/134897409/relimabefadomew.pdfIn PDF document text
    • http://hhizmet.com/sony_bravia_w602d_32_smart_tv_price_in_bdrne5j.pdfIn PDF document text
    • http://segwaywheelchair.ru/13182844960r4tum.pdfIn PDF document text
    • https://cdn.sqhk.co/tamoravuwera/ief2iar/53633941099.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/id4gjn6/28763463757.pdfIn PDF document text
    • https://cdn.sqhk.co/rusukumuva/higg6oM/top_10_richest_football_league_in_africa.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://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_504e73d86894481a8bd9a830ee40a4d8.pdf?index=trueIn PDF document text
    • https://391e4f24-9fc9-4707-ac06-338edcd9f959.filesusr.com/ugd/110ef3_c7db586b01284148bbaf4868ab7ec30d.pdf?index=trueIn PDF document text
    • https://17673d3b-e5d0-4e0e-8211-f079fadf35f5.filesusr.com/ugd/13ae68_c06c456bf36344ebbd6cb122fa4205de.pdf?index=trueIn PDF document text
    • https://a9750898-a066-404d-a796-54a2f5ad13bb.filesusr.com/ugd/60231a_fd46c307af614e4dbf11d3469da4dec9.pdf?index=trueIn PDF document text
    • https://20128683-61eb-4207-b985-d468b1a81fea.filesusr.com/ugd/0049ca_40cbed27c9de456997aa58ab7b8f2cc7.pdf?index=trueIn 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_off0000ea2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2B 5492 bytes
SHA-256: 9b2ec297b8140e1a7376dabb087cc6957edd739cf705b4867fc558b4a040a75e
font_01_sfnt_off0000fcbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBB 10304 bytes
SHA-256: 371ac5270c51d00051ea15388eaaf619577158dcd2ad41f2899b4561250ace56
font_02_sfnt_off00012008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12008 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f