Malicious PDF — malware analysis report

Static analysis result for SHA-256 de0d17882b37432d…

MALICIOUS

PDF

73.8 KB Created: 2021-09-28 18:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5c6b48f4ff8230874ab0a61fdb80bddf SHA-1: ce10d5c8e91658f11cb562824d746aa23cf07c8b SHA-256: de0d17882b37432db2597600b5014c91e585cfe44fa5a7836bca5a4b5257e0c5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The ML classifier and ClamAV detection strongly indicate malicious intent. The numerous external URLs, many pointing to suspicious domains, suggest a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://savitravel.ro/ckfinder/userfiles/files/24253343325.pdf In PDF document text
    • http://dallard.fr/ressource/site-image/files/lokatizatawa.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/dikexofopilewalev.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/57180834674.pdfIn PDF document text
    • http://gibisch.biz/files/files/12576460014.pdfIn PDF document text
    • https://revive.fashion/upload/files/43448757974.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/75200086122.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210911_175447.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/duzulikulis.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/24400999216.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/82628642958.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109201804087565.pdfIn PDF document text
    • http://zima.italie-ubytovani.cz/data/file/noxen.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-26/20210926193800862075.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/dejawixinajuges.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021090819431369.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/xivof.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/87369105409.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/20760697759.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/88588421757.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/zevupukanezakebizafafobib.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109140229464625.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/4314358661.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/43462631454.pdfIn PDF document text
    • https://unaizahic.com/Files/files/goximukiluxiwepa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=blue+dragon+awakened+shadow+romPDF 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_off0000babb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBABB 17816 bytes
SHA-256: 3bdaa7b5932591e8e2bd58b41b29476cce2d809cd6f26d3e2c1ed8244f8b5a67
font_01_sfnt_off0000e875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE875 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001008c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008C 10836 bytes
SHA-256: d4f887818900ce47100d0e98122b74bfe931dc970b5b38e48a20c14a9bdb73d2