Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c129fb58b99486f…

MALICIOUS

PDF

89.3 KB Created: 2021-03-16 05:43:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c29688415a6fc5e2ee50036134bb077b SHA-1: 230f7e5449376dd0ab6b0779d79603381f464bbb SHA-256: 9c129fb58b99486fb4cdf73d89bdc04506495b0b1251467f866e1796130b730c
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 detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to disposable hosting, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The presence of the URL 'https://botokaw.ru/strik?utm_term=how+to+score+reading+fluency' indicates a potential phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://botokaw.ru/strik?utm_term=how+to+score+reading+fluency PDF link annotation
    • https://rujikanonige.weebly.com/uploads/1/3/1/8/131872107/tosusagetene-seravefog.pdfIn PDF document text
    • http://wgathering.org/42421606538o5utw.pdfIn PDF document text
    • https://pekatube.weebly.com/uploads/1/3/5/3/135393066/maxuf.pdfIn PDF document text
    • https://sasadopebob.weebly.com/uploads/1/3/5/3/135324308/banokeweradufesede.pdfIn PDF document text
    • http://dietnatur.fun/speed_queen_washer_error_code_ed_12uk4dh.pdfIn PDF document text
    • http://hookup756.fun/78470294844k0xie.pdfIn PDF document text
    • https://mewuvonemifutu.weebly.com/uploads/1/3/5/3/135394867/5e18fe06b5aa.pdfIn PDF document text
    • http://mexicotop3.xyz/72282009642silr9.pdfIn PDF document text
    • http://tohld.in/32915622187tikze.pdfIn PDF document text
    • https://lefawiput.weebly.com/uploads/1/3/5/3/135324435/ruwuve_kikaredosu_wekajobuvafox_xukarovorizozod.pdfIn PDF document text
    • https://xudepafuvinuk.weebly.com/uploads/1/3/0/9/130969511/mapukalilavobon_voxaregutoremu.pdfIn PDF document text
    • https://gugukufetufa.weebly.com/uploads/1/3/4/3/134337187/fafuforupamogo.pdfIn PDF document text
    • https://taxajefikudo.weebly.com/uploads/1/3/4/7/134765143/5761120.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/4a864ee8-bf0e-4b6c-a30d-2aa273532294/permutations_and_combinations_problems_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e57b7d4-2cb8-4eaa-a0e1-0b97179fdc2d/algebra_lineal_para_estudiantes_de_ingenieria_guillermo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c882c2ad-9e8b-464a-b69f-ef12186fb036/fugalizuvodiwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e433ccaa-3b58-4385-84ef-7bdeb566451c/bapel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2683dd32-8e6f-400e-953f-4d12f9e7e496/cisco_ccna_200-301_exam_cost_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f455dcd-a5d3-4d06-a600-6c3ba1a8dddb/primeros_establecimientos_de_alimentos_y_bebidas_en_nicaragua.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df8f1902-526d-424b-903f-7611d27218c5/is_korean_banana_milk_healthy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d8b04e3-40b0-497f-9171-aee2cceb57e9/98273692138.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0639fe57-6db3-4eb4-8e90-f808391e2c3b/how_the_left_side_of_the_brain_functions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78ad7895-ce67-4ed3-885d-fc7c577a4278/83372692900.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23b5e839-6a40-4512-afe7-3e5e36548ad4/92101838819.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e844e42f-ff2e-4bc2-8e2f-3976a1f338d8/problemas_de_salud_en_mexico_actuales.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/519f23a3-6074-4353-8287-dfaf26280751/compound_shapes_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0bf3c36-edb6-4875-805a-2d89c8220ff3/5036238040.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_off00011e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5F 5344 bytes
SHA-256: 889a2dd3121bc2effa837c51ca34376d06934a7ae66677eaad3ebeedf8172192
font_01_sfnt_off000130b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B8 11196 bytes
SHA-256: 0a2e4bccfcf5cab11a6c93ae3b200a111452eab159b19df4fbb6fdd195f7c9a9