Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2448957b3871239…

MALICIOUS

PDF

75.1 KB Created: 2021-09-10 15:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d2a9f1d487893ade81f75f65b81e5b16 SHA-1: 0d310a5586c709aa3a0fbe39c158a1279b4d2ec9 SHA-256: c2448957b38712397f126ceed316a601554ff196695f34c01eba767ac95faf76
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with high-confidence detections indicating a phishing or trojanized PDF. The presence of embedded JavaScript (PDF_JS) suggests an attempt to execute malicious code, likely to facilitate the download of a secondary payload or redirect the user to a phishing site. The numerous external URLs, many pointing to PDF files on potentially disposable domains, further support a malicious intent, possibly for a link farm or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://birsamundapark.in/userfiles/files/65231130371.pdf In PDF document text
    • http://talleresjpg.es/img/file/61794656192.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/liwebegavikaxikavofa.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131c4af376ea---tevejikejemasazeromevid.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/suwetigovunidazorukesowew.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/57041919741.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/nigexamizararoziso.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/jevuda.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/vaxugobukagorasisaji.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/mavibob.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/40797193230.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/24626651994.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/1715680385.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/nevutivunupugirobubut.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/83999141525.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/88425410095.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/goloropepoxunirosebiwo.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/nawogipowulifawonuromi.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/krtohedknusk6ph0ju67fvcjbt/21455142901.pdfIn PDF document text
    • http://yibetter.com/data/files/5888214103.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/75617419851.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=mi+box+4k+not+detecting+wifiPDF link annotation
    • 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_off0000c24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC24F 17004 bytes
SHA-256: 3ec8a276a9793cd625208ab311f336b4dee64533bc346259c60ae960f998235c
font_01_sfnt_off0000ee4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10662 10664 bytes
SHA-256: e0954ab44fdc6db472af5b8bd868ef5fed57c7dcf8b36e28080962c050a3aac0

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