Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d2f13562565e31a…

MALICIOUS

PDF

76.5 KB Created: 2021-03-25 10:40:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ed38277c472cda3fbe29edc1d97bc2b4 SHA-1: e916970ac5c42006af4d7c60a9b251e7f2a693a1 SHA-256: 2d2f13562565e31a3beabb93df0724754d5a5fc951f74d9720b98e93cda6bd19
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and employing UTM parameters, strongly suggests a link farm designed to redirect users to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/123?utm_term=mba+cet+2019+result PDF link annotation
    • http://meetsalon.xyz/sevonidavokakyzip.pdfIn PDF document text
    • http://doxisolawasusig.66ghz.com/classifying_animals_worksheet_5th_grade.pdfIn PDF document text
    • http://litamomun.22web.org/gartner_report_2018.pdfIn PDF document text
    • http://zazorin.scienceontheweb.net/puxikonokukalemowom.pdfIn PDF document text
    • http://catsism.com/bad_girls_of_skyrim2u9cb.pdfIn PDF document text
    • http://topcreditmonitoring.info/ge_geospring_hybrid_water_heater_filter_alarmj1uvb.pdfIn PDF document text
    • http://bukuvud.22web.org/muzezob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gikikojumikobep.epizy.com/84993361397.pdfIn PDF document text
    • http://levewome.epizy.com/chs_inc_annual_report_2018.pdfIn PDF document text
    • http://vilatelisoto.onlinewebshop.net/web_to_converter_chrome_extension.pdfIn PDF document text
    • http://vobumubuto.rf.gd/bissell_1977f_symphony_pet_vacuum_and_steam_cleaner.pdfIn PDF document text
    • http://povapetaranawo.rf.gd/patapukoxizijujuwunu.pdfIn PDF document text
    • http://xigufogadenake.epizy.com/rabuzakegulaxesi.pdfIn PDF document text
    • http://lazasubesuwup.epizy.com/camping_merit_badge_requirements_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/316a814f-8e45-4527-8d87-295550811e8f/81359580773.pdfIn PDF document text
    • http://nukivamo.myartsonline.com/xipiwizibusizu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/446e45b3-4d2f-4d85-a7be-c7693cb17362/23115413578.pdfIn PDF document text
    • http://gerubetez.rf.gd/what_are_four_key_elements_of_good_academic_writing.pdfIn PDF document text
    • http://nopugorib.onlinewebshop.net/11599868013.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/transformers_prime_airachnid_voice_actor.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/33584415297.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_off0000ebc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC4 5420 bytes
SHA-256: f1758caab16770e11caea3a04ec3e567979ef5e579bc4f4cd7b8b1feaf40f922
font_01_sfnt_off0000fe49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE49 10916 bytes
SHA-256: b7ace23f3b0bbf21edf8b1346335dbe25c15ab9c95eb563d19fbaea2e792d258

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