Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c828e34d834e08…

MALICIOUS

PDF

82.2 KB Created: 2021-03-04 19:41:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9c5121eafc479baf7ceb4e2d5051d201 SHA-1: c2e99b95e442fc12b17f22d23db4af3a3cf9d53a SHA-256: 98c828e34d834e082e3979483bf98f052a31c28123d94c9ab12fb51aeb21df7a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a high density of embedded links pointing to a variety of domains, many of which appear to be disposable or part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body itself is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, which is not inherently malicious but can be used to create deceptive documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://bologen.ru/strik?utm_term=google+maps+api+project+ideas PDF link annotation
    • https://cdn.sqhk.co/dodamewope/4TPC5FC/stomach_ache_causes_ibs.pdfIn PDF document text
    • http://mainsale.pro/353213774157rsl0.pdfIn PDF document text
    • https://cdn.sqhk.co/josipinu/ipjbgiT/baby_alive_grow_up_happy.pdfIn PDF document text
    • http://kurs1.xyz/conversin_de_mm_a_pulgadas_formulaktpht.pdfIn PDF document text
    • http://pollsexpert.com/qlik_replicate_user_guide.pdfzwgb3.pdfIn PDF document text
    • https://cdn.sqhk.co/fifapupifig/hMifieb/new_tik_tok_instrumental_ringtone_2019_mp3.pdfIn PDF document text
    • http://hairsprof.ru/a_scanner_darkly_movie_dual_audio_downloadvvh5q.pdfIn PDF document text
    • http://iuts.space/lokelazfk8al.pdfIn PDF document text
    • https://cdn.sqhk.co/vinikawikuve/ghahcjn/pafiwuvenatetowojomaxepi.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/P3gf8bh/50_in_1985_50_in_2020_meme.pdfIn PDF document text
    • http://natural-shop.info/asus_maximus_viii_hero_alpha_ram_compatibilityta6qe.pdfIn PDF document text
    • https://cdn.sqhk.co/ragebobeb/J33yCgc/68207236056.pdfIn PDF document text
    • http://lazadacostumercenter.com/libro_usar_el_cerebro_gratiss4q5s.pdfIn PDF document text
    • http://mon-fortuneo.best/vifipesetozali7vmqz.pdfIn PDF document text
    • http://testvvd.xyz/famous_english_short_storiesuiqq6.pdfIn PDF document text
    • http://help-lnstagramcopyrights-verify.com/cup_of_jo_mothers_day_gift_guidexvugh.pdfIn PDF document text
    • https://cdn.sqhk.co/tajixixejafi/hDpTTic/9244273469.pdfIn PDF document text
    • http://hyipinvest.site/is_a_drivers_license_acceptable_id_for_flyingquoef.pdfIn PDF document text
    • https://cdn.sqhk.co/velujuvaxal/hj1OUXC/danogolifaripod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7da30a3c-8b38-4795-860c-e6f7a62aa54d/how_to_play_games_on_texas_instruments_ti-30x_iis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7eef13c-f5e4-4d6c-bc28-2afc72bc506d/commercial_real_estate_letter_of_intent_to_lease_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d966c6a-93fc-4748-829b-ed58fb409f9a/sinozegipegawisa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96e06e74-1e89-4556-aa08-de9329cb2b6b/que_es_aprendizaje_basado_en_proyectos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4df72ee-5379-430d-aea4-74fc7bca4063/starting_an_online_business_all-in-one_for_dummies.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_off00010462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10462 5500 bytes
SHA-256: fc8078cbf151456e762dc77ef6fcb0c989e530a3cfaaec7e11be36a31a9e8504
font_01_sfnt_off00011707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11707 10648 bytes
SHA-256: 679165b029cd965340a78518f29df9e69fb526f58f352ec12e516a6bd53e2a12