Malicious PDF — malware analysis report

Static analysis result for SHA-256 999fbdad2b428b31…

MALICIOUS

PDF

81.1 KB Created: 2021-04-13 14:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b4bc6c1cc74a41c9a6ca5901d27d7e4a SHA-1: c84ed7c62764998437bd8b1a42ba896b5ed30bc6 SHA-256: 999fbdad2b428b31fae18a404bddd2f3769677f3aedb9cf33da24b5f5205f98a
126 Risk Score

Malware Insights

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

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 0.9961

Heuristics 5

  • 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 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://dugedepap.ru/strik?utm_term=how+to+find+missing+side+lengths+and+angle+measures PDF link annotation
    • https://dununatanag.weebly.com/uploads/1/3/0/7/130775655/970bd6851dc1ed.pdfIn PDF document text
    • http://prizinsta365.site/the_creature_of_jekyll_island_summary4rhma.pdfIn PDF document text
    • http://zekojotewakugag.mypressonline.com/practical_english_usage_free.pdfIn PDF document text
    • https://fezulenigi.weebly.com/uploads/1/3/4/4/134485980/2041788.pdfIn PDF document text
    • https://lejufonibo.weebly.com/uploads/1/3/4/4/134470114/xazamupi_jodokeretotete_kigomowuz.pdfIn PDF document text
    • http://dewobazul.22web.org/american_truck_simulator_apk_obb.pdfIn PDF document text
    • http://liwitesuzemumex.sportsontheweb.net/37819590898.pdfIn PDF document text
    • http://rowomonug.mywebcommunity.org/croydon_council_housing_benefit_application_form.pdfIn PDF document text
    • http://9gusevshop.space/33196925175z5bnr.pdfIn PDF document text
    • http://nakalabaxis.mywebcommunity.org/serta_motion_perfect_3_king.pdfIn PDF document text
    • http://ig-about.net/359392519603mm9z.pdfIn PDF document text
    • http://sowoxapexemex.sportsontheweb.net/tegifavutupuno.pdfIn PDF document text
    • http://keto-menu.online/beats_studio_2.0_vs_3.0_differencevgu8h.pdfIn PDF document text
    • http://luxazeguliwa.iblogger.org/pironinitewuvule.pdfIn PDF document text
    • http://legendbilisim.com/kokewixezefojoj7gq42.pdfIn PDF document text
    • http://sukujugonada.22web.org/centrales_trmicas_de_ciclo_combinado_teora_y_proyecto.pdfIn PDF document text
    • http://jeratojovu.66ghz.com/biogenic_origin_of_petroleum.pdfIn PDF document text
    • http://womuvizitina.mywebcommunity.org/atharva_veda_translation_in_english.pdfIn PDF document text
    • https://rifuvosibimav.weebly.com/uploads/1/3/5/3/135383082/sagoxakomis_giwobijadex_lewosavijupake.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tiruweditivunaw.myartsonline.com/m_408_portable_super_bass_wireless_bluetooth_speaker_black_srs_xb33.pdfIn PDF document text
    • http://wudemexa.myartsonline.com/medicaid_clinical_coverage_policy_8c.pdfIn PDF document text
    • http://sabixukavizom.myartsonline.com/fekokifanimabixus.pdfIn PDF document text
    • https://b2691e05-be35-46d2-a26d-08c503de0475.filesusr.com/ugd/b15c0b_0fb84a15d65e42b4bc2a2e8298b86abb.pdf?index=trueIn PDF document text
    • http://farudigenudoze.onlinewebshop.net/physiology_of_the_heart.pdfIn PDF document text
    • http://tinasixubu.epizy.com/29708298934.pdfIn PDF document text
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_622ae3fd4f3f4f1d9dd0b10cf4667cf8.pdf?index=trueIn 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_off0000fe27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE27 5376 bytes
SHA-256: 4123fb77e40ce87564f2bc1fe5bd0006a9d3d0573c334f155f7e82b71aa16613
font_01_sfnt_off00011054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11054 10464 bytes
SHA-256: c9f3da42b82dfdbd778643afc6a9f609cf1667c86d6bb729f0fa7cc1726d70de

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