Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcefef8c20fe70d3…

MALICIOUS

PDF

83.1 KB Created: 2021-03-11 18:22:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: bce5d8211516463b47b699e6c53e1e48 SHA-1: 98d21daf23d6e34c05e092d0b373673297548431 SHA-256: fcefef8c20fe70d39ce27a8dda8a210f1affba434554eee65c38ebbae75f9458
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and embedded URLs, many pointing to disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a search term, reinforcing the idea that it's a lure to external 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
  • 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://baarspo.ru/award?keyword=aprendizaje+social+bandura+pdf PDF link annotation
    • http://namafafiteg.mypressonline.com/activities_for_toddlers_shapes_and_colors.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/hgdjahc/dental_assistant_jobs_colorado_springs.pdfIn PDF document text
    • http://gufopitasuwo.22web.org/how_to_answer_are_you_working_today.pdfIn PDF document text
    • https://cdn.sqhk.co/dipewoduge/hgjbgeM/26897208859.pdfIn PDF document text
    • http://fukiwurezopukof.mywebcommunity.org/44289033988.pdfIn PDF document text
    • http://ehaberdevlet.com/bmcc_library_contact43pjb.pdfIn PDF document text
    • https://cdn.sqhk.co/pelazuwoz/jjijtmN/88893096002.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/2iavb5X/panzer_platoon.pdfIn PDF document text
    • http://ninomut.sportsontheweb.net/what_are_some_old_country_songs.pdfIn PDF document text
    • http://fepafotejidug.iblogger.org/how_to_check_normality_of_categorical_data_in_r.pdfIn PDF document text
    • https://cdn.sqhk.co/texekikevow/zANhchc/solar_system_scope_full_pc.pdfIn PDF document text
    • http://idealslim-italiaoficial.site/cadwell_s_gold_quest_guide8uek6.pdfIn PDF document text
    • http://xodaxedepapopox.mygamesonline.org/best_mobile_computer_repair_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutorixo/VoEFaTa/shaolin_kung_fu_training_books.pdfIn PDF document text
    • http://xomunuxeju.sportsontheweb.net/nikon_coolpix_s3100_camera.pdfIn PDF document text
    • http://nat-yoga.space/borderlands_2_solo_class_guidecwlic.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mutodilevo.epizy.com/5158667150.pdfIn PDF document text
    • http://ferenekukosazu.epizy.com/east_guidelines_penetrating_abdominal_trauma.pdfIn PDF document text
    • http://detanavun.rf.gd/dark_souls_3_weapons_for_pyromancer.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_off000103f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F3 5404 bytes
SHA-256: 93c815fbea590f8866ffdb6647d211293f78fcd22314d59222528cff3959d07d
font_01_sfnt_off0001166c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166C 12284 bytes
SHA-256: d9c7668f49c791a2d25b521c53431b3aedb3bf9ab709b462e8b5db5405764565

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