Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8add5ae5cfab9c…

MALICIOUS

PDF

76.2 KB Created: 2021-09-23 00:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bcd781c41d4891fa4c9d7842e6d6e859 SHA-1: 472fe6711e79e5ca59ca117905c8aae4ba7fe29e SHA-256: fb8add5ae5cfab9cac81b4acca9e56cd9cf7202a54612f03837d1156e2d08eaf
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, characteristic of a link farm used to obscure malicious destinations. The presence of external URIs and the overall structure suggest an attempt to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://www.vnv.nu/admin/library/ckfinder/userfiles/files/dawaguzonadale.pdf In PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/14370162393.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/tazosuluredegezagu.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/37442033813.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/46867935013.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/09/file/20210909_123738_173.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/kurozutunukaxugejekegoku.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/desogujumimab.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/lilidudipitalu.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/60805993533.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/55213820276.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/xekifilupavorofuxif.pdfIn PDF document text
    • https://advik.net/userfiles/file/48314211757.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-14/20210914175237311619.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/15325291913.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412e16ee406---mowatujibokivaxema.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/27038892929.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/1777768671613b3b6cda931.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/dekoni.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/v9qf0p5qrsiho1mejc6qd3o4h1/53323858056.pdfIn PDF document text
    • https://marblobath.marblobaths.ph/app/webroot/img/files/juteralupikotaritem.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/jelikubaxix.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/javekadamigufikapidadiwam.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/47188536411.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ace+dragon+beyblade+qr+codePDF 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_off0000c0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C0 19436 bytes
SHA-256: fcb62bc08de7b07706115a7a13fcab13fcf23ea62e9831d119d2dfa882310a53
font_01_sfnt_off0000f382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF382 10568 bytes
SHA-256: 4623f4b2cd228c48602e5d83d30f1a5c01d7d7d80cfcfda7d43256a621ca71f4
font_02_sfnt_off00010b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1