Malicious PDF — malware analysis report

Static analysis result for SHA-256 51fec23fa736676f…

MALICIOUS

PDF

82.6 KB Created: 2021-03-23 10:21:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3e70be9fff0755705838d2f8e7c33acc SHA-1: 4ebcc5d962695e6a174226f5f696dd595b61ac05 SHA-256: 51fec23fa736676fd39a0520b43c442069f6d96303e19dce2e2b480397f74407
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically identified as a potential phishing lure related to a 'Bosch silence plus dishwasher not draining'. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, likely for phishing or to initiate further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pelibifir.ru/strik?utm_term=bosch+silence+plus+dishwasher+not+draining PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4387567/normal_6008002783aa4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473902/normal_5fda2cd37a698.pdfIn PDF document text
    • https://cdn.sqhk.co/memukodafum/jgfgi7e/avira_removal_tool_free.pdfIn PDF document text
    • http://digosige.mywebcommunity.org/59144375101.pdfIn PDF document text
    • https://cdn.sqhk.co/zalivelo/icbjhCI/kedodekokakuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476275/normal_5fe8ff2610232.pdfIn PDF document text
    • http://fovoxarofej.getenjoyment.net/binulaz.pdfIn PDF document text
    • http://degifutuv.scienceontheweb.net/swimming_pool_design_details.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372682/normal_5ff6d5a62a1b6.pdfIn PDF document text
    • https://cdn.sqhk.co/kixarozikej/jdhgidQ/best_potential_players_fifa_20.pdfIn PDF document text
    • https://cdn.sqhk.co/gapebeve/jid3jaH/draw_in_chess.pdfIn PDF document text
    • http://xijonofupawulo.mypressonline.com/vivekigevakegixemir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458628/normal_6054dbc4dd61d.pdfIn PDF document text
    • http://giwewigipebi.medianewsonline.com/analytic_geometry_quirino_mijares_download.pdfIn PDF document text
    • https://cdn.sqhk.co/busoleva/JjjG52Y/guvexowagafekenomew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a12dd339-0a32-4950-9d72-216ca1c09fa0/pifegexorijimepox.pdfIn PDF document text
    • http://zubiluwetij.myartsonline.com/behavior_modification_strategies.pdfIn PDF document text
    • http://dafukip.myartsonline.com/tilapia_fish_farming_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf4f489e-8bd0-4c03-8652-2bb308a9189e/5096393494.pdfIn PDF document text
    • http://zijedan.atwebpages.com/the_tempest_with_line_numbers.pdfIn PDF document text
    • http://tiwatimab.atwebpages.com/69607917866.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7676ae45-8d78-45a2-b944-519cbe35917c/67912180607.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20c90b68-a560-4f56-900e-a9673f1bf9da/tippmann_a5_upgrades_and_mods.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38431025-52b5-45fa-ac50-4aafd3dde5ca/good_icebreaker_questions_for_high_school_students.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_off00010443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10443 5476 bytes
SHA-256: 622a644009d4ff3f079b559462d96eca36f9be5eeefd38063c98d5b7cc9d7cb1
font_01_sfnt_off000116f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F4 11156 bytes
SHA-256: f342caabb7df7412f4c138c0ff3952391535399d763306d2bb00224ff71a260d