Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc0b00d7430c2b75…

MALICIOUS

PDF

85.3 KB Created: 2021-09-23 00:35:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9b2b71418e9b7fd3c98664710f1762a7 SHA-1: 7a0119cf143b8b63b86f320f90263a209540024e SHA-256: cc0b00d7430c2b75773e0f625de35c07bfaf297843fe1f065e3df97299d9cbb1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file with embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It contains numerous external URIs, many of which are part of link farms on disposable hosting, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://inwebjor.ru/uplcv?utm_term=android+app+on+laptop PDF link annotation
    • http://moretonassets.net/userfiles/65244421630.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/tebemunidefinunadanozizo.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/77321233330.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/dipanepegofukufi.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/wenivofepexawak.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/kivujolix.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/kutilumotas.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/valirubinoxujugubabenuga.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614085af13054---11011346510.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/8589764851.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///viwokolusagam.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/tamapasoripolegaki.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/83125813480.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/nuwasakepuzesigofewiw.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/zapibem.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/lizubelikuduwokawini.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/78570526254.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/limurobiwebakixotez.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161401e7c959dd---buvub.pdfIn PDF document text
    • https://12shio1.com/contents/files/ruxivuxeku.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210912/file/75425236213.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/76243431178.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_off0000ece9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FB 17180 bytes
SHA-256: c682dde14f086243cd80097a1ca7b2d12a2f3c5e4740ef0c9710f24a7872d805
font_02_sfnt_off0001315d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1315D 10068 bytes
SHA-256: c44df3d28a24cc4ae0d2d7da2f17d18d0b35a7e453eb2335f245d8c64318bc4d

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