Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff7ddd2e55a4c24…

MALICIOUS

PDF

73.7 KB Created: 2021-09-09 18:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1a991ecb0f3e0645267f9433dec0d80b SHA-1: 5510debdbd78edc29b0d4839fdd4bdb42a503ba1 SHA-256: 3ff7ddd2e55a4c24f670512b6f40c27e791058429b0c066d460a21da46d9fec0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely serving as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://irlanc.ru/uplcv?utm_term=apk+spider+man+miles+morales PDF link annotation
    • http://hycxchina.com/filespath/files/20210902111655.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/labefanumi.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/vidopuzelujaxovuvowawu.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/vowamulagofuxatujaremomi.pdfIn PDF document text
    • http://iknow.pl/files/file/kejarawuzumep.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613459c6a5dcb---zawitasoxujawavulitalag.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/vodefurusilewakag.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/17696704378.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/80621874667.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210905160113.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/tunuzoxobupogijalef.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/tonixilomibotadokel.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/65862012773.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/58947898496.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/vubixogejofupir.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210903182917.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/zatumoxikizovof.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/poropakepekulogazesax.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/lareniwedozaxilineri.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/2gr1rr2rkq6l2jbmfibgmbrmct/43194479665.pdfIn PDF document text
    • http://tzsunup.com/upload/56811113026.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/56469932574.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/lodimigesodebapurofid.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/bebabazupenatujavula.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_off0000bcd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E3 17056 bytes
SHA-256: ddfe755781eae3476be0bb11c05f99ea7cf0f5c083b513e7a64d63d5edc49c86
font_02_sfnt_off0001010b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010B 10528 bytes
SHA-256: 29414073f58c3afe766f64479a18f8914da133bba9bdc500e112762510f4257a

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