Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cab51d7ca5c6293…

MALICIOUS

PDF

76.1 KB Created: 2021-05-11 10:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2c56e4c8000f86e9a3fa336473078004 SHA-1: 7024b25a89d7f621edbea6ba841e200a132a5afd SHA-256: 0cab51d7ca5c6293cd8b9b6618589906330bd68d63fa3d744d4909bda93d6359
184 Risk Score

Malware Insights

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

The PDF contains embedded links, with one critical heuristic identifying it as a malicious redirector pointing to 'https://yafferge.ru/strik'. Another heuristic indicates the PDF is part of a link farm on disposable hosting, with a sample URL being 'http://feguxim.rf.gd/kopavu.pdf'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=eaton+fuller+18+speed+transmission+repair+manual In PDF document text
    • https://static.s123-cdn-static.com/uploads/4365536/normal_5ffcb374834c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403140/normal_606a427c317f0.pdfIn PDF document text
    • http://vukuvujuziku.iblogger.org/business_card_creator.pdfIn PDF document text
    • http://pabitej.22web.org/43653728747.pdfIn PDF document text
    • http://zepawagir.iblogger.org/kenmore_trash_compactor_model_665_manual.pdfIn PDF document text
    • http://bimizuzi.sportsontheweb.net/molitexe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484818/normal_605ee32285421.pdfIn PDF document text
    • http://tezuveripoxub.mypressonline.com/jack_reacher_tv_series_on_amazon_prime.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530937/normal_604404b24fb1b.pdfIn PDF document text
    • http://mawifit.iblogger.org/64813585227.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feguxim.rf.gd/kopavu.pdfIn PDF document text
    • http://limuzer.atwebpages.com/jekujosumumuzubuzusowuje.pdfIn PDF document text
    • http://sivikonalijuto.myartsonline.com/89534302725.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eebafc8f-33e9-4a83-b25c-9656de74e948/19343934132.pdfIn PDF document text
    • http://xuxalonitu.onlinewebshop.net/zufobekitivux.pdfIn PDF document text
    • http://lenepozomewu.epizy.com/gozugalivugifejunuwiwu.pdfIn PDF document text
    • http://lasakarafivof.epizy.com/sql_injection_tutorial_for_beginners_step_by_step.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/247b5a78-060f-4dd9-8d2e-538ab1366167/titulos_de_credito_publicos_y_privados_ejemplos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1571c989-ccbf-4e66-8683-74e675748380/cambridge_phrasal_verbs_dictionary_apk_full.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7673752-bd9e-43d8-b1eb-a5cd8c805c99/lisiwitegekefamopasurilox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f7e054c-53ef-48de-b8b6-ca13148353f5/watch_cyrano_de_bergerac_movie_1990_english_subtitles.pdfIn PDF document text
    • http://reditavipesef.rf.gd/job_application_form_sample_format_word.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_off0000ee63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE63 5392 bytes
SHA-256: 6e703320e9c1c1f12d30d3f2d160d4b914a5816427f94d6661296ac211c48039
font_01_sfnt_off000100ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AC 10096 bytes
SHA-256: 85d4d8b71217409c0132617aef568923b3824ae6e31cd47b723f2f1831c90d04