Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c1e84bdbfceef0b…

MALICIOUS

PDF

71.4 KB Created: 2021-09-10 01:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 76b524cbf0a6e083e334afdc1abd9851 SHA-1: bebeac3611940efd1bb3a6d1bd4c7bbc5072304f SHA-256: 5c1e84bdbfceef0b5d429beab9e04409eecd98ae9027701f11ef3a688091b395
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs, many pointing to potentially disposable domains, suggests a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the redirection to these external sites.

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 http://benetworkingpro.com/ckfinder/userfiles/files/29068282863.pdf In PDF document text
    • http://ellev.fr/upload/files/77518963305.pdfIn PDF document text
    • http://www.77ice.com/upload/files/3034547709.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/2092333148.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/lajuzutewun.pdfIn PDF document text
    • http://nemochem.cn/upload/files/zosusekutomudozunurolur.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/rekimodagemavimibinanuvum.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210908183257.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/posopososiwefatajilorat.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/14698812548.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/xedesokufovenon.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/xewuzazodejekip.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/43893437359.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/75685777458.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/50940458414.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/17232372475.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/21773286617.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/jejitiwesik.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/dusugiwademowane.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/dijoboxelubunifo.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613100ca5ae0d---fusokesuzomomoladuf.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42883038579.pdfIn PDF document text
    • http://rem-proekt.com/f/file/79105390627.pdfIn PDF document text
    • http://mastervin.ru/files/file/14600362524.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=android+control+panelPDF 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_off0000b888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB888 15808 bytes
SHA-256: ed88d971b05a5fa3491ec01ccc4441a8ef9a6b7c31638d7e69805ef097801d18
font_01_sfnt_off0000e0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FC 10320 bytes
SHA-256: 2d77e0bfcb93e85988add13ff170629a5381818bb6d451c348cc2b8b50bf442c