Malicious PDF — malware analysis report

Static analysis result for SHA-256 f692c3e87b49314e…

MALICIOUS

PDF

83.4 KB Created: 2021-03-22 21:50:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 42ba3c6b828dde8aaba3d0439feb3355 SHA-1: cd6f3aeb5aa69065ae61a27f52a74060b60d26d8 SHA-256: f692c3e87b49314e7c814e036c7cba1a72760fa7ca0d67420a7f3dd757da2894
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 0.9993

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://seumenha.ru/strik?utm_term=international+journal+of+medical+informatics+impact+factor PDF link annotation
    • https://cdn.sqhk.co/tunuviju/e0hahdw/10666779964.pdfIn PDF document text
    • https://cdn.sqhk.co/porodiwaten/jaihiee/nofufexi.pdfIn PDF document text
    • https://cdn.sqhk.co/tugadeboda/Wgc01hg/world_poker_tour_pinball_alternate_translite.pdfIn PDF document text
    • https://xujokutiw.weebly.com/uploads/1/3/4/7/134749543/5804abcd6.pdfIn PDF document text
    • http://xuwuvewisin.mypressonline.com/78107953503.pdfIn PDF document text
    • http://fevinoreniwelik.sportsontheweb.net/how_to_open_an_electronic_safe_when_the_batteries_are_dead.pdfIn PDF document text
    • http://vibolofisef.mywebcommunity.org/kewemejiferotesulasarup.pdfIn PDF document text
    • https://cdn.sqhk.co/vamosopon/ih2C979/cut_florida_off_gif.pdfIn PDF document text
    • https://cdn.sqhk.co/noloxunipe/oUmdPgh/daycare_registration_form_template_word.pdfIn PDF document text
    • https://milatesedupodil.weebly.com/uploads/1/3/1/4/131437919/pemorulogusufite.pdfIn PDF document text
    • https://pawomasa.weebly.com/uploads/1/3/4/7/134737305/1f760e6f.pdfIn PDF document text
    • https://disadoxamegipu.weebly.com/uploads/1/3/4/5/134527150/2417050.pdfIn PDF document text
    • https://cdn.sqhk.co/zozevuxe/pibjojf/case_study_houses.pdfIn PDF document text
    • http://malanefire.sportsontheweb.net/why_is_my_washing_machine_filling_up_with_water_when_not_in_use.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/hGpcgnM/casey_kesselring_hockey_agent.pdfIn PDF document text
    • https://cdn.sqhk.co/mosepoxik/ojdjhzp/nintendo_switch_pro_controller_for_sale_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/xezafube/jjajjTz/wwe_2k15_accelerator_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/nudavede/DaNghih/practice_for_spelling_bee_2nd_grade.pdfIn PDF document text
    • https://cdn.sqhk.co/bofagenined/fMq7wij/42552998582.pdfIn PDF document text
    • https://kimuremosov.weebly.com/uploads/1/3/4/7/134732255/dowewakokeli_waxor.pdfIn PDF document text
    • https://cdn.sqhk.co/jotapepikota/cyjiaLV/musafuxa.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/07853ecc-fdad-4c94-bc2c-116d7458fa03/cazadores_de_sombras_pelicula_completa_en_espaol_latino_descargar.pdfIn PDF document text
    • http://filosoko.onlinewebshop.net/tylenol_infant_dosing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22be4330-16d8-498e-8b6f-6ed420f7288f/hoover_carpet_shampooer_no_suction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8397346-5f9f-4413-bfc8-10fe1e865d6a/how_to_read_financial_statements_course.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_off0001083b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083B 5316 bytes
SHA-256: 0f93420b4d4750e384e627ac3d54177a19f6758cb4d5e9f5c50402ac83600a84
font_01_sfnt_off00011a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3D 10944 bytes
SHA-256: 7a98ff34928ec30e078ccda5dbf12abac04c0ed6c3fc911ff05b1e1153c9ff5d