Malicious PDF — malware analysis report

Static analysis result for SHA-256 62d400e6b2f3d687…

MALICIOUS

PDF

81.9 KB Created: 2021-02-27 11:40:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c58d1f6b29d8156d91e6e1a93ae96d77 SHA-1: 50b00006fbd1732cb7308df40d43e8a75083f1bc SHA-256: 62d400e6b2f3d687e02b86dfa77449f901fd3bc6c1f6a3c63310c0809ee0c143
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting, strongly suggests a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf', suggesting it was generated by a tool that can create PDFs from web content, further supporting the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/award?keyword=i+am+iron+man+chords PDF link annotation
    • http://nitesufi.sportsontheweb.net/echo_cs_400_carb_mod.pdfIn PDF document text
    • http://woodbonus.net/logic_problems_x209so1.pdfIn PDF document text
    • http://zoluvukabufe.iblogger.org/angular_6_formdata_append_not_working.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/remington_700_bdl_30_06_synthetic_stock_for_sale.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369933/normal_5fe38644687db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446289/normal_60381c8713ca4.pdfIn PDF document text
    • http://daludaja.getenjoyment.net/cdma_workshop_2.7_full_download.pdfIn PDF document text
    • http://rixorevu.getenjoyment.net/famuvo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478683/normal_5fdb52425bfdb.pdfIn PDF document text
    • http://zumepaposakuf.scienceontheweb.net/tavibunawuse.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459941/normal_6037e032244b9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tokavasetalan.epizy.com/rafagelelalot.pdfIn PDF document text
    • http://zoxizagujaniru.epizy.com/settings_activity_android_app.pdfIn PDF document text
    • http://luxorofanogefa.rf.gd/attendance_google_sheet.pdfIn PDF document text
    • http://xinifaduzinuvu.onlinewebshop.net/pevokijixabaxepulobitikup.pdfIn PDF document text
    • http://sezusol.epizy.com/zedetoxunosugepopa.pdfIn PDF document text
    • http://nukilaba.myartsonline.com/mifajexadeto.pdfIn PDF document text
    • http://xanomake.epizy.com/can_a_person_have_no_conscience.pdfIn PDF document text
    • http://nataxos.epizy.com/ac_market_old_version_free.pdfIn PDF document text
    • http://valupakukav.myartsonline.com/vatikefokinibetuzipapu.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_off0001051d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051D 5084 bytes
SHA-256: aa757ba40268b7d6921cf928379e42ab0656745f11c7dd9687adf2bda3a85f3f
font_01_sfnt_off00011632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11632 10632 bytes
SHA-256: b4a6c44fb153f50dd966b1a8f3191ce9e8e5b3099dbc850f30f3679d0948a0a6

Open this report in the interactive analyzer, or submit your own file for analysis.