Malicious PDF — malware analysis report

Static analysis result for SHA-256 485f9cadbfd5e132…

MALICIOUS

PDF

88.5 KB Created: 2021-09-14 09:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9bb8d1d902c3489a5bf4479c9f95eed6 SHA-1: ccaa65de902958e4d1a016e36604aa3624a33679 SHA-256: 485f9cadbfd5e132af6ceeee468328e09b9426c1c6bc39aad808a7442a8b51f4
134 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://xenang-mitsubishi.com/fckupload/file/39474821465.pdf In PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/judimulu.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/92831035253.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/56204881585.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/98655674813.pdfIn PDF document text
    • https://hoavily.com/uploads/files/68435470289.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/2335c0a759da9bcdfa45ce55caa41ea9/jatatabarujelewerirob.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/73929818349.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/dilusuniki.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/gipigebegugalilozisiku.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/juvugimudepat.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/fivopi.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/xinesasijepo.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/23703674224.pdfIn PDF document text
    • https://weilmclainboiler.ca/fck_upload/file/59282705185.pdfIn PDF document text
    • https://t2sc.me/userfiles/jajuv.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/suwovaderatepudo.pdfIn PDF document text
    • http://fxmeat.com/upload/file/7f1b5824479dfc4028466cec67be7a31.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/57862934007.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/zeguvogusanumokurupira.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/65426306017.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/vaxigefariparatuxeju.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/22240399632.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/vominogoraxu.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/senulaporelexagiti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=watch+zack+snyder%27s+justice+league+online+free+putlockerPDF 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_off0000f215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF215 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A27 18176 bytes
SHA-256: 10aa72b97685b19ce2d183efa3eaf7c6104f24916724b050508eb01ef0d74e42
font_02_sfnt_off0001395b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1395B 11424 bytes
SHA-256: 2d908f7d359b750185a23ed810c99ec0e9cb617d5d7225621b90364627b9bb3c