Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cc5a63512bd5c1b…

MALICIOUS

PDF

73.1 KB Created: 2021-02-24 16:31:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b4a4c88e8ee3e2cc7506bb4e9866ddcb SHA-1: 135f19b8ca33aa44087eec87511736d174adf960 SHA-256: 1cc5a63512bd5c1bf0cdc8b61303e49621d7997661d2dd5231da59120dc1ddc0
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are designed to redirect users. The document body, though heavily obfuscated, includes a URL that mimics a search result, suggesting a phishing or credential harvesting attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=how+do+you+get+a+bartending+license+in+texas PDF link annotation
    • http://tolunisusij.22web.org/rpg_games_for_pc.pdfIn PDF document text
    • http://wumewil.sportsontheweb.net/vizio_e320vl_remote_app.pdfIn PDF document text
    • http://13millions.store/central_diabetes_insipidus_guidelinesva45b.pdfIn PDF document text
    • http://rcasino.info/teranulamehbvrf.pdfIn PDF document text
    • http://tonedomopoja.scienceontheweb.net/kenmore_he2_plus_front_load_washer_repair_manual.pdfIn PDF document text
    • http://goloszauniver.fun/jifupilusibutixonodoxes40gq9.pdfIn PDF document text
    • http://xexapitanegis.getenjoyment.net/present_perfect_subjunctive_spanish_exercises.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/fajixe/lekidunupiwebuga.pdfIn PDF document text
    • http://rogofideb.onlinewebshop.net/4348457034.pdfIn PDF document text
    • http://lenepozomewu.epizy.com/96264584377.pdfIn PDF document text
    • http://tuwawolaninezon.epizy.com/dia_de_la_constitucion_mexicana_explicacion_para_nios.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/speed_slower_than_normal.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/22294804537.pdfIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/2007_6.0_powerstroke_turbo_back_exhaust.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_off0000e116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE116 5468 bytes
SHA-256: 0189aaa12551fb58a801a604a54d1a68a35b3843c454f2ad436cb7b9e582a0bd
font_01_sfnt_off0000f3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D3 10396 bytes
SHA-256: fce4eee4edb38730db3f456ecbed31360da7a805cf936e01173fd92ffbda0c2f

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