Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6abbe6a68c44923…

MALICIOUS

PDF

87.1 KB Created: 2021-09-14 12:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1fd0b7c0592805774419fc996235991a SHA-1: 1b65bf4b8debc035beb2b0d49e8b22db5797a9d5 SHA-256: a6abbe6a68c44923d6a4f7cd27d6ea464ecf338c614a57e59eb09d8f811ed6c0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to external resources and are likely used for phishing or to download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous links suggest a common pattern for distributing malicious payloads or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/25073500516.pdf In PDF document text
    • http://npi-management.org/ressource/site-image/files/33681411803.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/zusos.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/21272569823.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/91586525432.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/80078629166.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/59960831575.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210912145615.pdfIn PDF document text
    • https://specializzati.tecnaevolution.it/dataload/ckupload/dusamejemazutagojo.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/55075285103.pdfIn PDF document text
    • http://voijin.com/userfiles/files/bakexaxudulamamuzaleput.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/tewegifed.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/lesigedezamuw.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161389745a9660---23416579448.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/41e0d3e2850c143048594a39349f466b/59744236054.pdfIn PDF document text
    • http://195exim.com/datas/files/modagugewitake.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/68928723246.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/98602400128.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/44801446175.pdfIn PDF document text
    • http://josquin-capella.de/download/12499386646.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/bunidemufonibukede.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/duburirinezabu.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/xadomozidijoxogo.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/72776655330.pdfIn PDF document text
    • https://aramlasmerok.hu/uploads/file/farofagirumugubewu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=hack+v+bucks+generatorPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7D 18496 bytes
SHA-256: 8abbe1a53da58226602d4ef6c2da684ad12fa5626588d2570bb33f7be4eb7579
font_01_sfnt_off00011e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E21 10656 bytes
SHA-256: 3330e93785ffbbadd71455c3c390c3de909bf5eabf9f85b10c0729218530de4a
font_02_sfnt_off000136c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1