Malicious PDF — malware analysis report

Static analysis result for SHA-256 c763ca8447822660…

MALICIOUS

PDF

143.2 KB Created: 2021-03-16 01:40:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4298cd73ef8faa1657fba297ff51760b SHA-1: 52140dd1e533da236394ef508127dd6384662a0b SHA-256: c763ca84478226605ed9426dbba36545ca85dcaf0140524f6f8bb557678b22fa
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 0.9970

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://vilenefex.ru/award?keyword=ischemic+heart+disease+pdf+download PDF link annotation
    • http://motubudasuvapan.medianewsonline.com/efesios_hernandes_dias_lopes.pdfIn PDF document text
    • http://lg-copyrightforms.com/71887230130xhlax.pdfIn PDF document text
    • http://game-pro.xyz/243575238156xmzd.pdfIn PDF document text
    • https://lezexoxutipeb.weebly.com/uploads/1/3/4/4/134462335/7576599.pdfIn PDF document text
    • https://veralekixa.weebly.com/uploads/1/3/1/0/131069874/dezew-zazagomepajug-dimagemewa.pdfIn PDF document text
    • http://jotusimemirido.sportsontheweb.net/bushcraft_101_portugues.pdfIn PDF document text
    • http://prosucre.pro/olevia_tv_remote_programming1eqln.pdfIn PDF document text
    • http://rawiduti.medianewsonline.com/kivigijureziwevak.pdfIn PDF document text
    • https://lerelapukuvi.weebly.com/uploads/1/3/0/7/130740054/jenogaxorofeponibiz.pdfIn PDF document text
    • http://mizejodaf.mywebcommunity.org/74357167989.pdfIn PDF document text
    • http://ekzo-fruit.ru/428433025529zb2o.pdfIn PDF document text
    • https://wegenagozej.weebly.com/uploads/1/3/5/3/135394478/vavupalebabi.pdfIn PDF document text
    • http://elinekici.online/biranasesivuskusy.pdfIn PDF document text
    • http://naxajogilelog.medianewsonline.com/ejercicios_ecuaciones_de_primer_grado_1_eso.pdfIn PDF document text
    • http://gejulavofanutar.mygamesonline.org/fun_writing_activities_for_4th_grade.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://litorow.myartsonline.com/cub_scout_bowling_pins_pollard.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/google_sheets_create_chart_from_pivot_table.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/zefafekokonil.pdfIn PDF document text
    • http://nanaxidimidi.atwebpages.com/ge_universal_codes_for_vizio_tv.pdfIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_2bf640bf4e6946daab9b831d40dfbd8f.pdf?index=trueIn PDF document text
    • https://4abf464d-34d5-4c80-8de5-e64f30e04530.filesusr.com/ugd/8b3eb5_716dc5e984d341e19e8e2c939f481448.pdf?index=trueIn PDF document text
    • https://56f9ebfc-1b58-4ccd-90b9-24793863e956.filesusr.com/ugd/0f3536_63c070a0eee1404a8c198ef72cfe80d4.pdf?index=trueIn PDF document text
    • http://rijemow.onlinewebshop.net/raluxilowatupoti.pdfIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/minecraft_pc_game.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E86C 5212 bytes
SHA-256: 40ad06b5771da09087e5e4aff26daf960ba52160a2e13d7079ab04dabc1cf139
font_01_sfnt_off0001f9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F9FC 11428 bytes
SHA-256: 7a175a04a8636fe51273d19934891278e64dd3328371b03e235226a5ef9d9088
font_02_sfnt_off00022055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22055 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c