Malicious PDF — malware analysis report

Static analysis result for SHA-256 11bb91fe30083cd6…

MALICIOUS

PDF

82.3 KB Created: 2021-03-23 14:52:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5b3d490978c2bfa33afeba96f797ae70 SHA-1: ee327974a62904d3bc9d8c060f46f0d011b4b7d6 SHA-256: 11bb91fe30083cd6aee67c74b0b0ad1d79af7601339eeb5ba85bc53525d5907e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://resalured.ru/strik?utm_term=what+is+the+lesson+of+rumpelstiltskin PDF link annotation
    • http://repair-planshetov.ru/7972310829gn7de.pdfIn PDF document text
    • http://ranupila.mywebcommunity.org/dolobavipedabesevoninu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487192/normal_5fdac18dbd277.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466175/normal_602defdb93fbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413976/normal_60401072c70dd.pdfIn PDF document text
    • http://freshka.fun/how_to_write_a_personal_evaluation_essayfu5v9.pdfIn PDF document text
    • http://everydayy.fun/grade_6_math_decimals_worksheets37byl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465403/normal_602b67d0eed6e.pdfIn PDF document text
    • http://dexofuzexolan.22web.org/marlin_model_81_stock_for_sale.pdfIn PDF document text
    • http://ourfanz.com/carbon_cycle_quiz39daw.pdfIn PDF document text
    • http://boviriso.22web.org/binkw32._dll_for_gta_iv.pdfIn PDF document text
    • http://ighelperscenter.com/tobinaxr38ei.pdfIn PDF document text
    • http://kinorio5.xyz/zelda_a_link_to_the_past_items_locationskudz5.pdfIn PDF document text
    • http://vanevuxu.iblogger.org/how_to_make_chicken_tortilla_soup_slow_cooker.pdfIn PDF document text
    • http://wejuzofibab.medianewsonline.com/62574619043.pdfIn PDF document text
    • http://upsbox.ru/applied_calculus_10th_editionyz47v.pdfIn PDF document text
    • http://lejifip.sportsontheweb.net/jegirabafeduluxoxenage.pdfIn PDF document text
    • http://opendouche.xyz/gekalabiroh7dl0.pdfIn PDF document text
    • http://kogutojoveso.mywebcommunity.org/33952658453.pdfIn PDF document text
    • http://habercigo.com/big_green_egg_xl_buy_onlined649o.pdfIn PDF document text
    • http://sberpodarok2020.online/world_of_guns_gun_disassembly_cheatsgxzt3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jemukiguwuw.myartsonline.com/the_lusty_argonian_maid.pdfIn PDF document text
    • http://tesaminovosino.epizy.com/vibimufiwipoxig.pdfIn PDF document text
    • http://darozux.epizy.com/answers_in_genesis_vbs_2018.pdfIn PDF document text
    • http://mefadagisi.rf.gd/15610850574.pdfIn PDF document text
    • http://bamasagure.epizy.com/sea_of_thieves_bosun_bill_sheet_music.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_off00010292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10292 5216 bytes
SHA-256: 2d76d4863efdccc284621d6a321f767e83814884e8e01fcecaf13a7841928959
font_01_sfnt_off00011435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11435 10972 bytes
SHA-256: e445d6222c96213ca22bacb9d8e31c9f54f594a83374dc65f11fc822e27cc416

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