Malicious PDF — malware analysis report

Static analysis result for SHA-256 8632c08ba11036f3…

MALICIOUS

PDF

94.0 KB Created: 2021-03-12 07:05:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 29c50bf204e08f9c28b23274e7ff9c3b SHA-1: db77c3be90a8ecfd35ee44b8746248951f971c02 SHA-256: 8632c08ba11036f3aa7d0ffdb9884293f300e5f6e6e33102202d2ffbf483f2a3
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, indicating an attempt to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to obscure the true destination of the links.

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/strik?utm_term=why+did+the+north+support+tariffs PDF link annotation
    • http://dotekebenutedex.scienceontheweb.net/8281650674.pdfIn PDF document text
    • http://niburufajanuto.sportsontheweb.net/75727050415.pdfIn PDF document text
    • https://xowozasa.weebly.com/uploads/1/3/3/9/133999953/2dc36a255e015a5.pdfIn PDF document text
    • http://dilawiputonu.mypressonline.com/31654516476.pdfIn PDF document text
    • http://pugezesiw.mygamesonline.org/estudio_biblico_de_mujeres_cristianas.pdfIn PDF document text
    • https://cdn.sqhk.co/gegatuzikat/2mgiKrE/ding_dong_the_witch_is_dead_glee.pdfIn PDF document text
    • http://hookup754.fun/85121938891s9ul5.pdfIn PDF document text
    • https://nesexije.weebly.com/uploads/1/3/1/6/131607346/46468a9.pdfIn PDF document text
    • http://wapividazofar.scienceontheweb.net/christ_stopped_at_eboli_film_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/mixaluwekitu/idjjXmq/ruzolirep.pdfIn PDF document text
    • http://aycotoro5.xyz/35463881359qvv8i.pdfIn PDF document text
    • https://diloxutal.weebly.com/uploads/1/3/4/5/134598378/lexumilukenif.pdfIn PDF document text
    • https://zevigutuxokalu.weebly.com/uploads/1/3/4/7/134769804/9147646.pdfIn PDF document text
    • http://rupaduwovuw.getenjoyment.net/engineering_drawing_orthographic_projection_examples.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xopugup/dirt_devil_hand_vac_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/how_to_calibrate_automatic_wrist_blood_pressure_monitor.pdfIn PDF document text
    • http://dijuvunote.onlinewebshop.net/2546832142.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_off000132e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E0 5212 bytes
SHA-256: 71cec02e437251542212e854945e8d20da6999269e9b1a4a3eca95d99b760cc5
font_01_sfnt_off000144ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144AE 11240 bytes
SHA-256: 8236ae9c9464d70dcd9d28cf1dae552a1ed62e6cd25e7e91dbafd0ff8fd43397

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