Malicious PDF — malware analysis report

Static analysis result for SHA-256 2876d8b3aaf7b144…

MALICIOUS

PDF

75.4 KB Created: 2021-09-25 10:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c02c2479e7dfe56a5f27fa25272fcc63 SHA-1: 67b448fa2d29c6caa04cc36463bffaacc898220f SHA-256: 2876d8b3aaf7b1448eddfa465f1da055c26ac1f323fa2dd3a6cb3f37288cb002
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, suggesting the document is designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://laborke.ru/uplcv?utm_term=st+anthony+north+family+medicine+84th PDF link annotation
    • https://esperidiaogomes.com/userfiles/files/32706232244.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/puzuxuw.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/81175359737.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/pimisewepivuvelo.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/98191104707.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/somafuninamiponev.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/986362df9f7b27f837daa13c280d538b/mawunonawowovaturowofim.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161461875ab877---golepufitan.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/77380442373.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/lavezaturaxus.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/44536419190.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/48741781864.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/budiboxokolarelabiferolu.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/81113505214.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/60769920950.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/46961215009.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/692510770.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/worejunoruwejig.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/76271182965.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/rubonig.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/91626895792.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021091517560973499.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/rujusunugotu.pdfIn PDF document text
    • https://maisonfamillesrimouski.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/wenuladeg.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_off0000ba0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD223 11048 bytes
SHA-256: db4148ddeb2fee7645dbe6e72fee6249fc2d62206371483679aa268f89b473ce
font_02_sfnt_off0000ebaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAF 19376 bytes
SHA-256: 3fcdb657c4068186d516cd62c9da0089b212cfaa8ce4cef49eebfc31a848777d