Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d1c55a48c75479…

MALICIOUS

PDF

73.2 KB Created: 2021-02-20 01:28:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: a7fc1fd9d9b70eb4d0567b553c6a83a5 SHA-1: 78dbaace8524d15508598c06427d3448ac3740ed SHA-256: 20d1c55a48c7547940a0a04c94ab02f4d153f749fcbb506a98d059b4a4ed37b7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains a product name and application details, suggesting a lure to a malicious site.

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://jacksth.ru/aws?utm_term=tascam+202mkvii+price+in+india PDF link annotation
    • http://rcasino.info/918628497490h8m2.pdfIn PDF document text
    • http://leoidet.xyz/filadelfia_pelicula_completa_en_espaol_gratis_toy_story_4kz9qb.pdfIn PDF document text
    • http://sdorovie-sustavi.xyz/figures_of_speech_worksheet_grade_42uw2l.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/ghehaO1/hocus_pocus_cast_2_trailer.pdfIn PDF document text
    • https://cdn.sqhk.co/zanivuwiduvo/aYjebQS/topia_world_builder_gameplay.pdfIn PDF document text
    • http://zoomita.fun/top_topics_to_talk_about_with_a_girls1f9f.pdfIn PDF document text
    • https://cdn.sqhk.co/jirudumom/OiiDifJ/36306934208.pdfIn PDF document text
    • http://krym.today/ielts_certificate2tk7c.pdfIn PDF document text
    • http://kungfumalibu.com/barracuda_ng_firewall_configuration_guidew4vu1.pdfIn PDF document text
    • http://tonerinkstore.com/uc_browser_java_nokia_x2hx2un.pdfIn PDF document text
    • http://interplast.ru/metejojudediveniwanewimox6lmx.pdfIn PDF document text
    • http://upsbox.ru/6.0_powerstroke_oil_filter_housing_removalefks2.pdfIn PDF document text
    • https://cdn.sqhk.co/puzafusabuw/fheifET/52795455485.pdfIn PDF document text
    • http://wordwild-store.com/lincoln_and_guba_naturalistic_inquirnukch.pdfIn PDF document text
    • http://samettemiz.xyz/1289519745kp0fb.pdfIn PDF document text
    • https://cdn.sqhk.co/fepogosu/lhfiagN/zimudodelu.pdfIn PDF document text
    • http://telgrm.site/fikemajumorisu9oewn.pdfIn PDF document text
    • http://reactivaperu-viabcpi.com/fabrication_dun_extracteur_de_miel1k6o7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000de47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE47 5532 bytes
SHA-256: 98f9cfb0fffc93ff88075c0d3d1e1b035a4649ce43d269281bc2b82ea1f7a3de
font_01_sfnt_off0000f10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10A 11952 bytes
SHA-256: 06e130137891776a10a351566c1076506e7f8d1da8ec20b8a6021b363615f561

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