Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffbe2de806847acf…

MALICIOUS

PDF

137.4 KB Created: 2021-03-09 06:34:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 11063caedcb182ddaaa5cfdfd49e093c SHA-1: 9a4e1890c419324cf63b833f9a4100fd6bb59ec8 SHA-256: ffbe2de806847acfa80b4dfe609e16640efecde6a39ed30f36931faf4d09c5c6
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 6

  • 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 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://gimoguvi.ru/award?keyword=e.+coli+classification+pdf PDF link annotation
    • http://loduwij.scienceontheweb.net/11942515112.pdfIn PDF document text
    • https://cdn.sqhk.co/vozevadijut/gh9Kid2/marooned_with_ed_stafford_season_2_episode_2.pdfIn PDF document text
    • https://mitenipup.weebly.com/uploads/1/3/4/3/134363071/03df66.pdfIn PDF document text
    • https://cdn.sqhk.co/kovezozeseg/iagcSZk/xulixajitawo.pdfIn PDF document text
    • https://cdn.sqhk.co/tinulafi/c8zMIjd/wild_panther_sim_3d_apk_mod.pdfIn PDF document text
    • http://somubuzesixuwun.getenjoyment.net/wivepevomafixaviwota.pdfIn PDF document text
    • https://bizarejix.weebly.com/uploads/1/3/4/2/134265425/ruvadag-kekofikizoba.pdfIn PDF document text
    • http://pogawubujogeje.mypressonline.com/vewuxelafer.pdfIn PDF document text
    • https://cdn.sqhk.co/remimidotomi/giJUWjb/83485929283.pdfIn PDF document text
    • http://pazifelurup.medianewsonline.com/44808801988.pdfIn PDF document text
    • http://mujabelor.mywebcommunity.org/39854009528.pdfIn PDF document text
    • https://zavisedifigi.weebly.com/uploads/1/3/4/3/134316550/kusoduxazofize.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/kijCew8/migikarule.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/943100e4-11a9-49bf-941c-00543932ae35/saxipugidopabesikirage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8950ff67-886c-4d2a-8b18-78f94baf46ba/how_to_start_kerosene_heater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1f0285a-4eb1-4689-b28e-d33627de1740/simple_mechanical_engineering_projects_for_first_year_students.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24cb20a2-70ba-4902-8e1f-a124c8219eb5/61468283062.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67740e60-39cf-426d-a50c-1ed8ae6637c2/do_you_need_a_licence_for_a_forklift.pdfIn PDF document text
    • http://saxodanokijaj.atwebpages.com/sumiwadimonogitagu.pdfIn PDF document text
    • http://supuwevul.atwebpages.com/trx_strength_workout.pdfIn PDF document text
    • http://movasedumanepe.onlinewebshop.net/imax_b6_charger_cable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3763e3fb-940c-4b39-9884-ec41ae0d66b8/the_one_kiera_cass_series.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5406e2d9-c9ca-4ae4-b225-1fe57d9f45e0/woxozanubib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d35b2b5c-0f65-4ef1-9517-b807ccd84df6/what_is_the_biggest_living_creature_on_earth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bee5762c-50cf-4d5c-bb29-a33d73060d77/digitech_rp250_instruction_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b0e8d07-1c61-4b2e-a0b5-46092d867af3/volume_formula_for_right_triangular_prism.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_off0001d823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D823 5044 bytes
SHA-256: b810ca3b05ca8f0ef5e3b78cae73f7ec88aae52126977e36c282f5f5c0d31cf2
font_01_sfnt_off0001e96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E96D 14460 bytes
SHA-256: c054470327065109589c6ad0d346f8cbe94436f68ea8bc6f6ab4c9752426884c