Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccd1643fc4c4876e…

MALICIOUS

PDF

78.1 KB Created: 2021-09-22 11:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5a630e89cfd77c71ceaa046bff9ea5cf SHA-1: c5b7af236d5c0e82e9317c7da657f6e0532b1bcb SHA-256: ccd1643fc4c4876e0bc383d6cda72afe726919167149acf87ca87ae65c2775cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to external resources, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the attack pattern of using link farms for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://crewmak.ru/uplcv?utm_term=color+os+software PDF link annotation
    • http://bloodfaces.de/attachment/file/forazudosivajunopanufibe.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210904/2109041531095462350iyh16w3fl8s.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/67565430374.pdfIn PDF document text
    • https://shevian.com/images/file/sedor.pdfIn PDF document text
    • http://novichiha.ru/pic/file/35397143294.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/56612470675.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/povawaxe.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/79186030867.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/zorup.pdfIn PDF document text
    • http://alvitraders.com/files/29671649934.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/vilemovaxogexasuv.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/siwofabefamikukepi.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/71317993321.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/dasupasolevalinive.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/taxitofewidazetadege.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/62910sqrocsl1ju8lc1g8siqsf/lisixekegefuwekoxixufedu.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/28983018226.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/rorigezitopepu.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/xiparisogurutot.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/bukagimufuxogobukemaza.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/20377668660.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613adeed293db---23445202247.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_off0000ce82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE82 17576 bytes
SHA-256: 00aa2b753c5a0e61514be2029293b4fe8835a0403f838a623fb53ff40ffba354
font_01_sfnt_off0000fc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001143b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143B 10128 bytes
SHA-256: 3348daaa070b92739d4fedb9ecd0b1b6abce936ce6ede2cbdcb150ff58aa739f

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