Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ffbf6594085c9e…

MALICIOUS

PDF

80.5 KB Created: 2021-09-19 06:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d63689fc4c4d4521011bb581cd153b64 SHA-1: 9c973f9bde1344fde9eac9eb515d80861afb8883 SHA-256: a4ffbf6594085c9e648769997baf5558ee85412860079e3ba66b29428741fa0a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://allytemp.ru/uplcv?utm_term=game+frag+mod+apk PDF link annotation
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/2264894711.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/jawumujuf.pdfIn PDF document text
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/25441075536.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db0f6d97b9---lagomipawifurenativixit.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/53899116858.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/44761953869.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/75288154091.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/83118406665.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/30679394828.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/70224005633.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/51290461026.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/kurafexasefipuwiveguw.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/nizokofarakopunob.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/8029920376.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210901071044.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/30512225447.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/nelejuxawuxurova.pdfIn PDF document text
    • http://mc-opony.pl/files/file/60591580873.pdfIn PDF document text
    • http://ktcz.eu/files/files/64138231752.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/jopabawekowuvajumizuw.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/karaluramafutebejinot.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/niwiwepovanabovire.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/vunewilakeviniluxabu.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/1c3lo4ahc3utdlfupt74tij1r3/18919879231.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/mitubur.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_off0000d822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD822 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF034 17620 bytes
SHA-256: 8cfe3c7e4f88997433eb5eb366693b4f5b2095a25415f129867a1ad07603a374
font_02_sfnt_off00011d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D35 10464 bytes
SHA-256: 3e7ced4a14342bd2691c7d02389a13bf28db0e3e76f8117fdecca9de0a67aa42