Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfdab953b37402fe…

MALICIOUS

PDF

76.8 KB Created: 2021-09-21 03:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dd39c26773cc5795ba5a81ec2aa0c309 SHA-1: ac0a2aef73924069ba410ad25f9f54220f34b878 SHA-256: dfdab953b37402fe795d2b999aaaf84df181be6597abac5e1960df40cbef0eb5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=sleigh+ride+pdf PDF link annotation
    • http://laulumaja.fi/ckfinder/userfiles/files/19127782394.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/25756907460.pdfIn PDF document text
    • http://gaudi.tw/upload/files/wejemavoj.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/30151807003.pdfIn PDF document text
    • http://alhegazgroup.com/userfiles/file/momawitof.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/jexejovizujovev.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/pasenavajewalodaduxu.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/62715499626.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/61580301474.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/xonenupo.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/muwepebis.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/vodososawopotemoluv.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/malodujoduzazabamepenej.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/67354799713.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/motobewulitibugokere.pdfIn PDF document text
    • http://coolbiotech.com/upload/files/29973930802.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/161325171cd1d9---zugiterunijetanukik.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/f5ccd4a2ba7fdf2a50da0458f999e6e5/wedodumamizelep.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/jokezetukumisuvemiwufane.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/95248694379.pdfIn PDF document text
    • http://hmed.vn/upload/files/makub.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_off0000c840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC840 10200 bytes
SHA-256: e9242b4946a1d3d5ac22419599f68125f76732c563e9d1a682434784db480069
font_01_sfnt_off0000deea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEA 18164 bytes
SHA-256: 10f15216387e2213306e2f4540b34910b935d9c0cd76732283aa93de9eed75f0
font_02_sfnt_off00010e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.