Malicious PDF — malware analysis report

Static analysis result for SHA-256 8716062924ddacb8…

MALICIOUS

PDF

69.9 KB Created: 2021-09-29 12:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f33b93ee8503e24d03daf8c0d1362a82 SHA-1: 2539db701dcfe215b491358c2fe80ad66f41d326 SHA-256: 8716062924ddacb8e5ecd7c78cb2b4a064de444e3df677998a70a375094aaa5d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by multiple heuristics, including a specific ML classifier and ClamAV, indicating malicious content. The presence of numerous external URIs, many hosted on potentially disposable domains, suggests a link farm designed to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to this behavior, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://drafthe.ru/uplcv?utm_term=android+device+connect+to+pc PDF link annotation
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613685e944bb9---44779211524.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/30888028803.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/26413241955.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/89681827571.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/ruwewape.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/4578764325.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/judemofuzobumubera.pdfIn PDF document text
    • http://slsnn.ru/content/files/niluju.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/ad0b3137901ca541471e9788e91b9ebc/39317648902.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/refazilowedurew.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/8965299187.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/dulajodarudotip.pdfIn PDF document text
    • http://abc-tel.ru/data/File/vukavupib.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/xovekinerar.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/lixexagiforem.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/xajad.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/17894740559.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/nuzokebizupejifodir.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/jenoruniri.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/2967173667.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210928_25919F7AB9732323.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/93601633794.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/xifetiza.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/fogezavodepurakope.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/68258157958.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/26676599213.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_off0000b507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB507 14976 bytes
SHA-256: fdffd5671d13c52e4aeac93ca23fd79f7e782d1afdbc16476dad57554f386efb
font_01_sfnt_off0000dafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFD 10176 bytes
SHA-256: 6b4659ba37cf64454513c59cdb9456de69f27d7306d0c47e5980a8c7d0e2f70d
font_02_sfnt_off0000f1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1