Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c2ee6fb8dd8031…

MALICIOUS

PDF

86.6 KB Created: 2021-03-30 04:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b6c147bdef6b89b70af28475e5baf040 SHA-1: a2022a449215fd62c8e06b4591bd931dea8b36e0 SHA-256: 21c2ee6fb8dd8031be71b0a8adc21ba075209941ea1944480d2e293d4bae657d
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 hosting and are indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/wix?keyword=bone+of+the+ancients+explosive PDF link annotation
    • http://kinorio5.xyz/misaxuz27zlu.pdfIn PDF document text
    • https://sejirefado.weebly.com/uploads/1/3/4/6/134682993/fa4c31f8356b330.pdfIn PDF document text
    • http://top-agent.ru/kenmore_elite_washer_error_code_f27hu9ru.pdfIn PDF document text
    • http://copyright-security-ig.com/lecture_notes_on_computer_hardware_and_softwaredr31c.pdfIn PDF document text
    • http://gta-msk.ru/aqa_a_level_economics_revision_guideo4sim.pdfIn PDF document text
    • http://look-hotel.com/under_your_spell_80s_songsua47.pdfIn PDF document text
    • https://nagejezesalu.weebly.com/uploads/1/3/0/8/130874580/pukunizazuvij.pdfIn PDF document text
    • http://rankingcoach-apps.com/thanos_meme_template_i_used_the_stonescj5xj.pdfIn PDF document text
    • http://sportplays.ru/80715570131c4u1p.pdfIn PDF document text
    • http://zumigiguba.22web.org/52927865264.pdfIn PDF document text
    • http://sizikigaraju.22web.org/87801250075.pdfIn PDF document text
    • http://liseravuziw.22web.org/how_to_insert_table_in_google_docs_on_ipad.pdfIn PDF document text
    • https://vapevaka.weebly.com/uploads/1/3/1/4/131407737/fovakafalufo_wesun_detojipigani_nudoxabewi.pdfIn PDF document text
    • http://madamzero.com/gedifokewif40h1e.pdfIn PDF document text
    • http://valuburikodajad.medianewsonline.com/a_whirlwind_tour_of_python_book.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mifedisiso.atwebpages.com/syntactic_analysis_exercises_with_answers.pdfIn PDF document text
    • http://puwekaxaxowiza.epizy.com/tonopasof.pdfIn PDF document text
    • http://daforewepon.epizy.com/model_by_laws_nsw.pdfIn PDF document text
    • http://gulavofi.epizy.com/meaning_bacterial_transformation.pdfIn PDF document text
    • http://wefusav.rf.gd/jilam.pdfIn PDF document text
    • http://risepaxazitomep.rf.gd/how_to_turn_100_000_into_a_million.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_off00011213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11213 5184 bytes
SHA-256: b6fb2310f1d6168668a3eade03821021d7ac3b50f82278b0897bc3845ea51414
font_01_sfnt_off000123ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CA 12104 bytes
SHA-256: 37cfd452482636ce230e956f59ab08a1d059bb2676e9116ed3b4618ad3ee4efd

Open this report in the interactive analyzer, or submit your own file for analysis.