Malicious PDF — malware analysis report

Static analysis result for SHA-256 590d6233487bb66a…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 19:30:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d8976be70730e826b99b4846da3a6890 SHA-1: 108f68a2922639dd722cdda9ca2f76a23ebe7cfd SHA-256: 590d6233487bb66a929761158b04e2df8bf6daab7bf8a7e49f6fff2aa917002c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. 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 link farm behavior are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://oniceh.ru/uplcv?utm_term=redmi+9+power+auto+call+recording PDF link annotation
    • https://magyar-logyogyasz.hu/fileok/file/xibamobaluret.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/55004416184.pdfIn PDF document text
    • http://gotween.com/userfiles/file///keluzajedaf.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/juzofufuxi.pdfIn PDF document text
    • http://weingut-suppan.at/files/23745976276.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/wexefapofazi.pdfIn PDF document text
    • https://norservis.com/files/files/93225659765.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/kubuji.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/tixotanukavak.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/dajegolotivapo.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/wafubemumiwemibuditeni.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/gonesuwa.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/de72d4df56ffbf05def020ab9cebee37/73213220681.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/jafinatogitatija.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/lovojuzokajujogiw.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/pakafu.pdfIn PDF document text
    • https://actor-conseil.com/files/file/gonefajesiz.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/zivevapojutokijuwupa.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/62881124711.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/90038628805.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/14085418852.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_off0000da84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA84 18076 bytes
SHA-256: 21756b9ea4ac37094f39a6266af945de31b9232601b8926088222e059a0594cd
font_01_sfnt_off000109ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12206 11088 bytes
SHA-256: caac940a348bef3f59f6338fe1c6688aec591834983e7ff64fbd6c078397dc49

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