Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f8105c33f38ae6…

MALICIOUS

PDF

72.8 KB Created: 2021-03-19 14:23:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd2a3bab191ccb7dcd8266a7724cae9b SHA-1: e0d526f5a0556a9ddefd443683aa0d92e1043edb SHA-256: f0f8105c33f38ae6e8beff566259ba31d4daf74f1eab7d5b45b8e6c29b87072c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest a common pattern of using documents as bait to redirect users to 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://soxebez.ru/strik?utm_term=kyocera+fs+1135+default+password
    • http://beviluxenumiliv.mywebcommunity.org/menawa.pdf
    • http://bitiwiz.medianewsonline.com/cantonment_act_1924_pakistan.pdf
    • http://gefosezidubajoz.scienceontheweb.net/nesilemivepupa.pdf
    • https://cdn.sqhk.co/wojusipi/fJhdCup/4d_wallpaper_2020_apk.pdf
    • https://jijemelagif.weebly.com/uploads/1/3/4/0/134016961/pulenuba.pdf
    • https://cdn.sqhk.co/wanevakaxuma/3tMhhic/snowball_fight_gif_facebook.pdf
    • https://tiwedipetubed.weebly.com/uploads/1/3/2/8/132816066/89533343f.pdf
    • http://javosewo.sportsontheweb.net/writing_task_2_vocabulary_download.pdf
    • http://gekifek.scienceontheweb.net/dipomowoboloxivuvojibi.pdf
    • https://cdn.sqhk.co/baruduwege/hepwuhj/subterfuge_meaning_in_urdu_language.pdf
    • https://cdn.sqhk.co/kinanekoxo/f067ih6/62820495208.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/095ef623-f1e0-4af5-9584-e9545916b09a/what_age_is_appropriate_for_13_reasons_why.pdf
    • https://s3.amazonaws.com/wizuluworafid/logical_fallacies_quiz_answers_quality_core.pdf
    • http://bavatesivo.myartsonline.com/28730763790.pdf
    • http://pimobepetokonud.myartsonline.com/parallel_lines_meet_at_infinity_2016.pdf
    • http://rawigukegopafot.onlinewebshop.net/list_of_all_warrior_cats_books_in_order.pdf
    • https://uploads.strikinglycdn.com/files/2081026d-4dc6-4429-83b9-db1c01647e35/how_to_crochet_a_baby_cardigan_for_beginners_step_by_step.pdf
    • https://s3.amazonaws.com/lolijexejomak/vojirixabalir.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc41.bin
27e512ede325a9a615d9115165afb8a6dfbf9e8a2698c5246298948c7398cc76		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC41 5652 bytes
font_01_sfnt_off0000efb5.bin
89e387f710acc91a16a40123c806a5adb2c03451bed5409e86d8808a3c116831		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB5 11212 bytes

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