Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f2f77c76e450d1b…

MALICIOUS

PDF

89.4 KB Created: 2021-09-20 00:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 181f8c3e02e82db98fc5d6a6ff916a82 SHA-1: 4efc986dbf93a2e55795f91e8452b8195e5d330e SHA-256: 0f2f77c76e450d1b9ee4c04be9f8a30696b6a30778cc814520b66b5c67482cd6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, the document body is heavily obfuscated, and numerous URLs are present, many of which point to potentially malicious domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132cfc586b38---23559396737.pdf In PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/tubenanumutizud.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/lemaxabafezatefujo.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/80672413924.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/b05cab0acce048e56e5c84eec42dc788/43461310505.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/genalowisisonofufexow.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210904/file/16307251313717.pdfIn PDF document text
    • http://df-2.de/images/daten/file/latolu.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/75010296266.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/mudunolojukoduwidozasem.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/walikifosadazuvilinezipu.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/62964065761338eb5213ec.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/ramewowowironuzugotemogu.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/50780515875.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/miwifebubofide.pdfIn PDF document text
    • https://flomogroup.com/upload/files/bokowiped.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/lomovizexox.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/52347680685.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/kadajunifepe.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/sidufevosezaku.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/55753344538.pdfIn PDF document text
    • http://k1a.ru/images/files/file/jomomofedikijudegikujuwa.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sawezazexibixomuf.pdfIn PDF document text
    • https://quizai.com/uploads/files/vosivokodagowu.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/45850323425.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/74447181947.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=word+whomp+unblockedPDF 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_off0000f918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF918 10668 bytes
SHA-256: 6a4dcabba474db6daf2c9dd824857b0c58a6bbe488ff5349ae83a50ed44fd4c1
font_01_sfnt_off0001111c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111C 18224 bytes
SHA-256: daabb91590269e32f45b254645bdd583264c35b8ec061735c29dc3ef1fa1d5cb
font_02_sfnt_off00014069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14069 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1