Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb608fc176619724…

MALICIOUS

PDF

83.1 KB Created: 2021-09-14 20:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3d66308bb7ba96a7ddf4c32ba0ab3407 SHA-1: e73fc8581de2eda9bbda980864a4a5a677bc132e SHA-256: fb608fc176619724e6366dbb1fa966d8c723298644bea3bcbe4485f1412a15ff
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or scam content. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://queure.ru/uplcv?utm_term=best+game+in+the+world+offline PDF link annotation
    • https://resttour.com/images/userfiles/files/90771951934.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/63784596108.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/nelufu.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/3005508514.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/7559375689.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210907064406_d4g0et.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/nejenedagujitudedofuz.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/81914187293.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__61327C533A7E1.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/56774096694.pdfIn PDF document text
    • http://101balkon.ru/upload/files/gezegonaderodokes.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/xufufofaf.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/dotekidakikogokobozezez.pdfIn PDF document text
    • https://lapakunited.com/contents/files/givazakosupepozojas.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613506c68d4fc---raxepulobibozidavop.pdfIn PDF document text
    • https://nexusmediation.nl/files/76173319535.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/98705570390.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/4101983418.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/nanatavitifefe.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/56969994642.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/rotetoriguse.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/77654026006.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f17dc8800e---mizozasigigadezutop.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/vivoru.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/nokuwumenafaseja.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_off0000e000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE000 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF817 10940 bytes
SHA-256: fb1bd780f3c84e3922bb2d5e83b8d37317af94451736b9353b51f466fbddf26f
font_02_sfnt_off00011117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11117 17768 bytes
SHA-256: 1e04323f18e5580df22b9244b082a7716d6c81ee12ad7f80b9357d115ed854e5