Malicious PDF — malware analysis report

Static analysis result for SHA-256 24bf01cfb9401020…

MALICIOUS

PDF

72.7 KB Created: 2021-10-01 16:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1b553adc27a7ad73d275fb3ac74f78f4 SHA-1: a8dbb0462b475afb955f66b2de281b9e8b18dd55 SHA-256: 24bf01cfb9401020b342649751af9c161f2215680f04ba3a87745e45e03d0824
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, 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 techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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 https://archism.ru/uplcv?utm_term=master+tamil+movie+free+download PDF link annotation
    • http://nesthomes.in/userfiles/file/riwiliresiv.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/40185161588.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/fatejirosuzili.pdfIn PDF document text
    • http://gyliver.ru/files/files/17006891251.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210904144539_219515617.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/dijifegufokapa.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/25934951559.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/lukutonavezakujozoxofowut.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/94590383125bdff623f93fe78613fdd7/tuliduledasejeno.pdfIn PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/visikaxasan.pdfIn PDF document text
    • http://moretonassets.net/userfiles/45383540906.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/xafixedemetilulimawax.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109061150402429.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/76703253198.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/nopowonimagoxom.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/10681583297.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/jotelepu.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/89456971341.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/tafemasefemo.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138db79a2520---sedepukigoruniva.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/juranabereraranobulepu.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/28323677162.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/jadumerelumo.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/94306582728.pdfIn PDF document text
    • https://ikra-ekb.ru/files/fckeditor/file/In PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/nejazujojilelukux.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_off0000b7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B0 17420 bytes
SHA-256: f15203198dc5b350dab79e2b95b32acf1364ae28099af9b3b5e1895557e4c82b
font_01_sfnt_off0000e417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE417 10660 bytes
SHA-256: 229c9d757a293c9baec76ea3153ccd4534eee3514f9eb320c954a867c697a0cb
font_02_sfnt_off0000fc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1