Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ecf7cce1289a83…

MALICIOUS

PDF

85.1 KB Created: 2021-03-19 16:16:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a370d902b6b93cfd0476ee301566201a SHA-1: 346b3d0922aab0fab3df3f986b5227634290da72 SHA-256: 51ecf7cce1289a83808b1460668011956f760c185daa8429da257f0583d7bae7
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 0.9991

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=casio+g+shock+3232+turn+off+alarm PDF link annotation
    • https://kotasixunepa.weebly.com/uploads/1/3/0/7/130776076/7491518.pdfIn PDF document text
    • https://vejexuwelukilik.weebly.com/uploads/1/3/5/3/135340180/kimalupal-vafimogu-rafebozuki-gawexisoxu.pdfIn PDF document text
    • https://dapavivilo.weebly.com/uploads/1/3/4/8/134895477/gejenisekegera-favexupumavut-kubege-kixitezofu.pdfIn PDF document text
    • http://tekelas.iblogger.org/graphics_card_driver_windows_10.pdfIn PDF document text
    • http://filmera.ru/table_top_dirt_bike_jumps8cigj.pdfIn PDF document text
    • http://sopugepibimel.mypressonline.com/keto_diet_basics.pdfIn PDF document text
    • https://nazalufu.weebly.com/uploads/1/3/1/4/131409274/0feb2ba41629980.pdfIn PDF document text
    • https://devigejijakefu.weebly.com/uploads/1/3/2/7/132740662/e7f77531.pdfIn PDF document text
    • http://vijexibat.mywebcommunity.org/centre_parcs_longleat_map.pdfIn PDF document text
    • http://leree4.club/nobakewuwoxizefovusezumuvlw.pdfIn PDF document text
    • https://lebamemodeli.weebly.com/uploads/1/3/0/7/130776101/refesalopo_dokeja_podovexus_zenodaget.pdfIn PDF document text
    • http://prostosite.site/believer_video_song_starmusiqbz4y0.pdfIn PDF document text
    • http://mandarins.space/refepeberulivigubogupf9l4g.pdfIn PDF document text
    • https://wozukepob.weebly.com/uploads/1/3/4/0/134017809/b5a2d83526b5e0.pdfIn PDF document text
    • http://kovuzaxaf.medianewsonline.com/66933346873.pdfIn PDF document text
    • http://bawoputameded.iblogger.org/88530390138.pdfIn PDF document text
    • https://pewukuma.weebly.com/uploads/1/3/4/7/134762228/purekojoxuret.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nenidexixod.epizy.com/66760054800.pdfIn PDF document text
    • http://badiwofotafazol.epizy.com/20368587192.pdfIn PDF document text
    • http://fokibofu.epizy.com/samsung_bd_h6500_review.pdfIn PDF document text
    • http://gudugapapilile.atwebpages.com/rejoxoxa.pdfIn PDF document text
    • http://minegavanifur.rf.gd/the_bulletproof_diet_cooking_methods_roadmap.pdfIn PDF document text
    • http://kedokonox.rf.gd/81716648892.pdfIn PDF document text
    • http://kijemuf.epizy.com/42303703619.pdfIn PDF document text
    • http://dorikajiwewut.epizy.com/who_fears_death_nnedi.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_off00010d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D11 5560 bytes
SHA-256: a642941fec7477a748f9b96e81e4254860dd88db420f2d4b7f85114b50e87938
font_01_sfnt_off00011fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD0 10836 bytes
SHA-256: 487a0ff992590b88e4b573e55378b60aee171d04f69d4a551c037bd973e64bef