Malicious PDF — malware analysis report

Static analysis result for SHA-256 257be15a0cf0c4a6…

MALICIOUS

PDF

83.3 KB Created: 2021-09-20 01:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0b7f3e557fa838302784cf8020ca5749 SHA-1: 13cefa2727983f8d123f616c27e3c8c0155abbc0 SHA-256: 257be15a0cf0c4a60994abbbcf09e7c879b8f964099df483d20f0603297b5aca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://coretry.ru/uplcv?utm_term=i9300+mic+ways PDF link annotation
    • http://pincailight.com/zk/UploadFile/file/2021090513380773499.pdfIn PDF document text
    • http://erdbau-rauch.at/50318595198.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/80133926793.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/oghdg06j7281tpbb1c9upqbj7i/94876820330.pdfIn PDF document text
    • http://kezheng.net/Upload/file/sadajulelijodi.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/rupeg.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/joriwubed.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/93022152266.pdfIn PDF document text
    • https://totounited.com/contents/files/21798388120.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/58594467057.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/buwuxafu.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139e7570d90e---wugamumubujikoveriwesu.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/ziwenisodapufixomatotagor.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/vixurixejituwez.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/bupesuzutalisegute.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/wakifemukedimuneb.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/devubomebix.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/35916312121.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/49770067445.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/95110436503.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/katogegowipoxiduz.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/34616611895.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/gogoxe.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://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_off0000e20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA21 10404 bytes
SHA-256: 11b2c72ca36fbe086eb0926ccc3724b9873b502063be1ca1b56821a654db02a4
font_02_sfnt_off000111ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CE 17676 bytes
SHA-256: bec6fc243511740eaaaa9fec6dd783f56fc7107256a3d94eaa18b38590c8196f

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