Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f7f0d5f9e54495…

MALICIOUS

PDF

69.4 KB Created: 2021-09-25 08:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: abdeb3acd89dbdab35854c748fb37d7a SHA-1: a55311bca4f9044085385c8a40a1f95774151e1c SHA-256: f9f7f0d5f9e5449529d8637301f39a536e76b9874149c2224a1173f9a082170f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and form a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://lrm.mcdonalds.ua/ckfinder/userfiles/files/retizejizejubobe.pdf In PDF document text
    • https://ego-sofa.tw/uploads/files/202109200735371083.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/39364680223.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/82864732081.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/39289363429.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/wikajipit.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210922205802708123.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/90865308850.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/zexezijirojebozi.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/fejepejiganunobolufovoge.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/3581736954.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/kapoturuxeze.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/37212004440.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/xabomukibajewul.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/debonoroguvogiku.pdfIn PDF document text
    • http://rld-carbon.com/file/64964302060.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/14592402225.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/mepejulixewaginadotu.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/83239213145.pdfIn PDF document text
    • http://wdnederland.nl/file/7518837688.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/manajexolojufijezide.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/rubiruxebalewokox.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/1980055580.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/83192739508.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=anime+battle+royale+game+androidPDF 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_off0000b140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB140 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC957 10660 bytes
SHA-256: ff28c3ba3e148e1c74a79eae10b0a2c408d9ef434214f9baadb61c29009496da
font_02_sfnt_off0000e181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE181 14632 bytes
SHA-256: fb7f0e047188765fd70d0184f087ba5349505bcd15f58cc7dad6c3f35fbf370a