Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c51d8f61ba0ae9f…

MALICIOUS

PDF

89.8 KB Created: 2021-02-27 18:50:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e20aa03d8dbee1ff63c97d3aeaa69e02 SHA-1: 76ec22e7c7ddd3d440b6bd0814aeb04a06559c40 SHA-256: 1c51d8f61ba0ae9f4a16b0a1591b88dd742f5fecb8f105cb40e109b644b29576
126 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to song lyrics, suggesting a lure to disguise the malicious nature of the links.

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://dugedepap.ru/123?utm_term=i+don%2527t+care+i+love+it+lyrics+meaning PDF link annotation
    • https://cdn.sqhk.co/jopubelo/cnUhbgj/magic_doodle_joy_kaleidook.pdfIn PDF document text
    • http://blaugrana.ru/adobe_systems_stock_performancehc50v.pdfIn PDF document text
    • http://kernig.online/jirisujatupanuwopunugu2a5r.pdfIn PDF document text
    • https://cdn.sqhk.co/vilubofi/SSgg4zK/kenujoxivalon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445320/normal_60355fcba5421.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446507/normal_6006bfde96508.pdfIn PDF document text
    • https://cdn.sqhk.co/nukuzulu/jShdEYm/battlefield_companion_app_on_windows_10.pdfIn PDF document text
    • http://peromopativej.mypressonline.com/descripcion_psicologica_de_los_personajes_cronica_de_una_muerte_anunciada.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450040/normal_5fec50b8108c4.pdfIn PDF document text
    • http://winovigamaj.mygamesonline.org/all_souls_day_2020_catholic_date.pdfIn PDF document text
    • http://tosefabebiribow.scienceontheweb.net/where_can_i_get_my_cat_neutered_for_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fonobufusig.rf.gd/android_sdk_tool_setup_exe.pdfIn PDF document text
    • http://xowobovu.myartsonline.com/xugeluno.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A36 5392 bytes
SHA-256: bc5a0cbd110e8e8eb33ada26c2db03aa41315773a41a593472c794de7fe3a2ca
font_01_sfnt_off00011c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C89 12748 bytes
SHA-256: 387bb579e5866d8a227f57738bf0ecd653d7ee24b5c3567359032c0bfe9483bf
font_02_sfnt_off00014516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14516 16120 bytes
SHA-256: 46d9b83afd797048ab251ddfc9ca9a6db44f3280724c231f6a80a061bcc6fc12

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