Malicious PDF — malware analysis report

Static analysis result for SHA-256 250255a66ad12475…

MALICIOUS

PDF

81.2 KB Created: 2021-09-17 15:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d8b5a6a08a7ac62c3fdb3809b94a74a0 SHA-1: 4fa316773cfc56b36d67af960ee1f8c084a824f7 SHA-256: 250255a66ad124750950f589a817473f81016875b86b0b08a25c405b1485ba10
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to disposable domains and are structured as link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, aiming to redirect users to potentially harmful content. The embedded JavaScript, though not fully detailed, is a common vector for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=download+gigabit+offroad+mod+apk PDF link annotation
    • http://ctcinsulator.com/uploads/file/junaw.pdfIn PDF document text
    • https://limadelimon.com/images/file/jesubiwivajuledi.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/wuvuzuxafefed.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/11680193394.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109120502332325.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/nejamukapepil.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/48365564621.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202109/file/210907050030217540v75kko81krjv.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/91516067181.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/ruvalejegujowepomajuvimen.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/gojiwapasagi.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a06e3bf2b---zutowomekejapubojonovesu.pdfIn PDF document text
    • http://amirmazandaranihospital.com/ckeditor/files/files/naxetigejunivuwasaxaze.pdfIn PDF document text
    • https://music-group-store.com/upload/files/79103215600.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/23909206882.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/40067002207.pdfIn PDF document text
    • http://immopolignano.lu/images/22705674771.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/66605654530.pdfIn PDF document text
    • http://ihdbd.org/upload/files/13460215106.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/48439863133.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/folizatolusurepodip.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614380778ed54---varalopabu.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/gojenipow.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/tatotubifurabikigos.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/32948088290.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_off0000d7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CE 17792 bytes
SHA-256: c2b6034e7073656b524da9d8a51a5b9d4bd6f91393e84d1f0c292492ce4ec605
font_01_sfnt_off000105f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F2 10860 bytes
SHA-256: a84d12390771c8edb3fdfff60044bca5e720998e52e6c3c535a1ecb07b528b71
font_02_sfnt_off00011e98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1