Malicious PDF — malware analysis report

Static analysis result for SHA-256 2256c86162916e30…

MALICIOUS

PDF

83.9 KB Created: 2021-02-27 11:55:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 564c92c56d86200eebc24f3a6a7e6d6c SHA-1: d4445aac35cb586a936781dae3623cfaaea563f6 SHA-256: 2256c86162916e30dae55a1e29fb3caf78be69e36a9bc5cce092f071bfd232bb
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to disposable domains and are associated with redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were extracted, the PDF's structure and embedded URLs are designed to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=what+is+the+meaning+of+hr+business+partner In PDF document text
    • http://rowowevu.mypressonline.com/c_oops_advanced_interview_questions.pdfIn PDF document text
    • http://gagimubu.mywebcommunity.org/how_to_structure_spanish_sentences.pdfIn PDF document text
    • http://sajiwurejedetu.sportsontheweb.net/60853696313.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/rainbow_fish_download.pdfIn PDF document text
    • http://vazawujuzu.sportsontheweb.net/kidde_nighthawk_pi9000_manual.pdfIn PDF document text
    • http://vizazovabula.mywebcommunity.org/bluebook_citation_journal_abbreviations.pdfIn PDF document text
    • http://paselon.getenjoyment.net/trane_xl80_furnace_flashing_red_light.pdfIn PDF document text
    • http://kixiwogazu.sportsontheweb.net/wix_add_files_to_google.pdfIn PDF document text
    • http://worelimupuvefam.mywebcommunity.org/40260919398.pdfIn PDF document text
    • http://gekifek.scienceontheweb.net/wolejofoxotaturujukajore.pdfIn PDF document text
    • http://jedusajinud.mygamesonline.org/ts_16949__iatf_16949_comparison.pdfIn PDF document text
    • http://zuregazezoral.mygamesonline.org/the_one_thing_planner_discount_code.pdfIn PDF document text
    • https://bewirupudafa.weebly.com/uploads/1/3/1/6/131607000/000784.pdfIn PDF document text
    • https://dojibabebane.weebly.com/uploads/1/3/2/6/132682208/donulululonanup.pdfIn PDF document text
    • http://kogutojoveso.mywebcommunity.org/contabilidad_de_costos_significado_en_espaol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/reading_comprehension_worksheets_grades_1-_10.pdfIn PDF document text
    • http://nabenejajoko.myartsonline.com/dillon_650_toolhead_stand.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_off000109d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D9 5436 bytes
SHA-256: 2ecd46e7874f3f1a4ead1174335752e8a58211743bf105ccc03999100510ecbf
font_01_sfnt_off00011c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3A 11228 bytes
SHA-256: 65f84ea9423bb475641c48a6f4453989c0937c927fdf67980587356c9aaf1d04

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