Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c24b98f156cc836…

MALICIOUS

PDF

76.6 KB Created: 2021-03-23 00:30:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 8f10f7b20e0c37ab23e41e0ab75733b9 SHA-1: ba1042b89699be86486c5bed25f305ce955e024c SHA-256: 5c24b98f156cc8368673d35397c49d1a3c7f9a9e2e904db34493580c607995e6
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous external links, many hosted on disposable domains, suggesting a tactic to manipulate search engine results or redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of SEO spam or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/award?keyword=estadistica+para+administracion+y+economia+anderson+10+edicion+pdf PDF link annotation
    • https://cdn.sqhk.co/bitizulokiva/smDOvic/quran_in_english_and_arabic_text_free_download.pdfIn PDF document text
    • http://fesotisifofil.mygamesonline.org/carpal_tunnel_release_exercises.pdfIn PDF document text
    • http://ralugugifoxatir.scienceontheweb.net/doxapa.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwaseja/ZkIicBf/75877495039.pdfIn PDF document text
    • https://kunipasufit.weebly.com/uploads/1/3/0/8/130874165/9374799.pdfIn PDF document text
    • http://tozidak.mygamesonline.org/australian_super_application_form.pdfIn PDF document text
    • https://cdn.sqhk.co/jobubexivex/iiakgeb/coin_pusher_game_vegas.pdfIn PDF document text
    • https://cdn.sqhk.co/nezazexador/gjkgdjj/download_blink_amino_for_blackpink.pdfIn PDF document text
    • https://fuvepuzineg.weebly.com/uploads/1/3/4/4/134463404/120b4d0e562.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bowegasobufur.myartsonline.com/ipl_2020_match_schedule_time_table_download.pdfIn PDF document text
    • http://megigezorozo.atwebpages.com/twilight_render_for_sketchup_2015_free_download.pdfIn PDF document text
    • http://miganuvag.myartsonline.com/majus.pdfIn PDF document text
    • http://gibidapasajug.atwebpages.com/40068979968.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1d0faa0-03b7-42b7-b539-78c0ab9459b4/58644420390.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4301982e-a55d-4525-b843-d5ea4c913f43/menefulirafusekorukom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/967a8fba-1bb8-43eb-8751-e11eabec03db/rewexezexeru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/215f1fa6-ecdd-4e58-89fe-5a1cee6d08b4/percy_jackson_and_the_olympians_3_full_movie_in_hindi_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/527b557e-faee-43ae-ba5d-4921be9a6b6d/spectrometric_identification_of_organic_compounds.pdfIn PDF document text
    • http://gozuketitara.onlinewebshop.net/la_familia_de_pascual_duarte_resumen_completo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6500d441-05a4-4515-a094-311462988f77/where_is_the_model_number_on_a_speed_queen_dryer.pdfIn PDF document text
    • http://mavuriwowul.myartsonline.com/best_annotator_ipad_pencil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f48ec058-018e-40a6-b39d-c7d68f5de605/xunufigudonimifomo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5291ef95-8fed-4d70-834d-50d9382b36b9/alan_v_oppenheim_signals_and_systems_solutions_slader.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_off0000eb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3D 5520 bytes
SHA-256: 35ccca0b667ac092828d15d972840eedcffd34655aeacf6bb702d672e741b815
font_01_sfnt_off0000fe01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE01 10852 bytes
SHA-256: 4fa1758d3c18017936586a1e8ed52eb8ef62866c8323a9c636e1ce5dcc15b119