Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f3e98c5cffeb98a…

MALICIOUS

PDF

70.0 KB Created: 2021-09-26 07:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 66cf74113cd9fc1e92b1b580cf002cc4 SHA-1: 1c5afa4e17d69c46d6fbcad091e474ac321ebf46 SHA-256: 8f3e98c5cffeb98a6ba18d23a3fd4704576a4cf33d2c0bedb12d914ba0de6676
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URLs suggests the PDF is designed to download and execute a secondary payload, likely for phishing or trojan delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious nature by indicating a link farm on disposable hosting, often used in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=wwe+mayhem+is+offline+game PDF link annotation
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/be9a8277d0a00685f77a07f7eb94a07d/lozopofubusa.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/rakikapunabomerijesidob.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/37749038022.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/lelen.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/rawojebefiliki.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/76119449101.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109061952451963.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/wososigelakoratesipow.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/gesogeborazapukabaf.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/puvideragutosazag.pdfIn PDF document text
    • http://elpijisystem.com/file/totalerubevozewozumuxuw.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/95108553899.pdfIn PDF document text
    • http://canyonmeadows.org/userimages/98361304262.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/duletu.pdfIn PDF document text
    • https://specializzati.tecnaevolution.it/dataload/ckupload/dusamejemazutagojo.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/90972553823.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/81122511995.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/1096370999614c0f3a33c5a.pdfIn PDF document text
    • http://upakuika.com/img/file/42464103230.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/ridatefo.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/girenagokosurutezuruzivak.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/94052277136.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350bad0746d---fegaseropebifuluxukaw.pdfIn PDF document text
    • http://kisito.com/userfiles/file/gukotaxawumisaze.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109021222042257.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_off0000b27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB27E 10656 bytes
SHA-256: aab6b0f2d97efcb4dd18064e9d73970455377c739af03f2046606d22172b4aea
font_01_sfnt_off0000cac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D6 15460 bytes
SHA-256: 06cc199901344bfda2b0ea001a919d737b311a89d4aa40fe964613a00112c1c8