Malicious PDF — malware analysis report

Static analysis result for SHA-256 feb8d3c0b67481a8…

MALICIOUS

PDF

69.6 KB Created: 2021-02-23 23:48:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 9b123e85324361b4783ca15d308ed26e SHA-1: 389abe21bc460a59afe7398c98135b68c6ae7a3c SHA-256: feb8d3c0b67481a8a7b869cfb46b6048737ded8a98b37f5a75f2e0a803c868e5
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a phishing or redirection attempt. It contains numerous embedded URLs, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to educational worksheets, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=subject+predicate+worksheets+for+third+grade In PDF document text
    • http://golosa-spasibo.ru/43047306877wc9gr.pdfIn PDF document text
    • http://axecheat8.xyz/vaibhav_trivedi_chemical_bondingzoakk.pdfIn PDF document text
    • https://diveziriluro.weebly.com/uploads/1/3/4/4/134447321/3900347.pdfIn PDF document text
    • http://goodsun.space/weight_tracker_pregnancy_week_by_week_kgd8nrz.pdfIn PDF document text
    • http://luchdobro.site/mere_bhai_song_pagalworld6rv8q.pdfIn PDF document text
    • http://intereriia.com/format_sd_card_canon_t3iokhtr.pdfIn PDF document text
    • http://nat-fru.space/daddario_classical_guitar_strings_amazon62upt.pdfIn PDF document text
    • https://fitinunajixir.weebly.com/uploads/1/3/1/6/131637477/memapagon.pdfIn PDF document text
    • http://bt-management.website/heterogeneous_single-_atom_catalysisbmrzl.pdfIn PDF document text
    • http://wilitubejibo.iblogger.org/how_much_do_chick_fil-a_assistant_managers_make.pdfIn PDF document text
    • http://voboxexi.iblogger.org/58575377629.pdfIn PDF document text
    • https://kofijowuz.weebly.com/uploads/1/3/4/4/134446653/978cc4.pdfIn PDF document text
    • http://polfact.site/korijezupawozanologijuv3odel.pdfIn PDF document text
    • http://begemotiks.space/ejercicios_del_abecedario_en_inglesvebjv.pdfIn PDF document text
    • https://vonuvevija.weebly.com/uploads/1/3/1/4/131407152/4679432.pdfIn PDF document text
    • http://ing-cliente.com/paint_company_swot_analysis_reportm7dpg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://depikurowunegit.epizy.com/visual_c_2010_express_dark_theme.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/punctuation_exercise_for_class_5_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/cello_android_tv_review.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/25413939739.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/bharatiya_vidya_bhavan_school_kolkata_admission_form.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_off0000d195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD195 5860 bytes
SHA-256: 9a1d54e958bbc8db9b3da2b78b91784a5c15eb768a8b834951b22dcb51c51c52
font_01_sfnt_off0000e598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE598 10264 bytes
SHA-256: bcb7c22441501b07fa67ba0432b79cb0b276b7bbd1a90ca47bc18535ba9cabc8

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