Malicious PDF — malware analysis report

Static analysis result for SHA-256 758aee3f9d0f0277…

MALICIOUS

PDF

87.2 KB Created: 2021-09-24 00:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7817d35df9218d1e052de5fd03afece2 SHA-1: 680bfce828e738f1e70dc88ea66e0afee1a5860f SHA-256: 758aee3f9d0f02772765d37812b9f996c8eecca5a4dcc05c5f5bc9574cc32733
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the presence of external URIs and the overall detection profile strongly suggest it's part of a phishing campaign, likely using embedded links to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.sunriseacademy.in/ckfinder/userfiles/files/48882987268.pdf In PDF document text
    • http://hc6999.com/userfiles/files/sonugonukukawulu.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/4763431057.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/sutamijaw.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/24959500737.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/34158836681.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/80565471551.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/42537400753.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/70959472384.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210908014854189.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/42649746494.pdfIn PDF document text
    • http://faradbox.pl/files/file/81296760582.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/44147125334.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/nazusoronilezitubodasape.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/jhdcro8f8cuk5a73mhdk7m57d1/46812675010.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d507c9f4c---54695299007.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/wibizamugamejonigutarazar.pdfIn PDF document text
    • https://netpage.info/userfiles/file/967817392.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/47512803036.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/17305823111.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/mewamuz.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/92383408716.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/nokejaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=download+manga+online+pdfPDF 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_off0000f20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20D 10560 bytes
SHA-256: 12bc1ace8d55a950295d78b41b64414f0d2c17042911722d589bb692ea75c589
font_01_sfnt_off000109e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F5 17512 bytes
SHA-256: e6f0af4cc003e75a8a3e7fac723d8aa6d9a6153e40bac0c48e61882deb0c55c8