Malicious PDF — malware analysis report

Static analysis result for SHA-256 0430a781a63a0f7a…

MALICIOUS

PDF

74.6 KB Created: 2021-09-21 09:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 003bd3e936b523a79a014148d3e76fe5 SHA-1: da6d1c04058b4d293fab084af352b39c40f4bc69 SHA-256: 0430a781a63a0f7aec80a26aee373711a5cf2d213bac746174980e86d3f5a93f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, suggesting it may execute malicious code or redirect users to external sites. The presence of numerous external URIs, many pointing to potentially disposable domains, further supports a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using many links on disposable hosting, common in spam or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://aescantabria.es/upload/fckeditor/file///pixawopol.pdf In PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/63262980098.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/vorijemadabeze.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210912/files/20210912124444.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/36903909141.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/27503680568.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/mofabuka.pdfIn PDF document text
    • http://gro-felix.si/uploads/ruwubositizoluzud.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/ximibalijo.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/54905222628.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/61784021625.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148532fdf6f8---34224743654.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/divuboje.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/42252244535.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/pimuxita.pdfIn PDF document text
    • https://labelmarket.pl/data/file/85188313068.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/55516701076.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/72048551278.pdfIn PDF document text
    • http://apex-architect.ru/images/file/31629393595.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/rivamuxirowururazelod.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/a81aed585ce91bd6ce7217faab8a941c/gogasofaket.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/vivulowaw.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/9548399382.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/63954316745.pdfIn PDF document text
    • https://klcconsulting.eu/klc/file/50823422041.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+find+the+vertex+of+a+graph+of+a+functionPDF 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_off0000beed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEED 17032 bytes
SHA-256: 982fc3e738351e5d6f7827ae494b41b01b99b33e3f7a2f563b1a3e3e2aca3e9a
font_01_sfnt_off0000eb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10344 11032 bytes
SHA-256: 27e4e242074fdb6c88625db23bc3a1e1109795a937d290dae61b9c99d662711b