Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b932418d06c4c7e…

MALICIOUS

PDF

75.5 KB Created: 2021-09-09 09:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c5bdaf99eb116e2f1996299db50f6d79 SHA-1: 409f2af786cf376aeb2f046695c1f671300fe5b0 SHA-256: 1b932418d06c4c7e663b29a385dcef5c56eb26af6f55652cbbbfc5624890f15c
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a visual download button further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://ashioke.com/images/library/File/bagazoliti.pdf In PDF document text
    • http://davidhammerstein.org/userfiles/file/melexataxo.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/vasulivup.pdfIn PDF document text
    • https://alpinashop.bg/files/kizuvetomawelinarekewaxup.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/78671894145.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/42250518086.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/nomagaponenakimezavef.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/44747329054.pdfIn PDF document text
    • http://arablift.net/userfiles/file/35092073590.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/12386007283.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/72809331179.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/34424497816.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/17020915509.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/zoduxusujadamor.pdfIn PDF document text
    • http://sentralperdana.com/file/jonuguxavuzemomalewakum.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/vs7l2c97fgiih0u78jo2rkahn0/41238954458.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090907484847.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/74583182895.pdfIn PDF document text
    • https://tuinvandecruys.be/file/lojivumolisob.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109031018005529.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/zuzewuletunogi.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/beguzosepojowuzamuvuroji.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/25599306129.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/65929627287.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613573ed35be8---fupagex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=kaanchli+life+in+a+slough+watch+online+freePDF 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_off0000c2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D9 17108 bytes
SHA-256: 8c546d1413befaae83476a895670bff51949009ac9b94e1467cac9d0ff70163a
font_01_sfnt_off0000ef20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF20 10792 bytes
SHA-256: c9e57c60b2f336f934f5119e52069f86dce1e2dd4de5e15f6df59ccc89667dd6
font_02_sfnt_off00010804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10804 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1