Malicious PDF — malware analysis report

Static analysis result for SHA-256 af45650773819354…

MALICIOUS

PDF

71.8 KB Created: 2021-09-26 17:38:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5580b64d81c5912f058320a0d964422a SHA-1: 1a7d26d61de15ff8ee75e6eab77ab1311a7259b1 SHA-256: af456507738193542384e8d28dd6207df871dce9ad2863c1953b9ee7072e3c87
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://ndfeef.com/radiant/mechimobiles/userfiles/files/87857608940.pdf In PDF document text
    • https://408of53crownstreet.com/assets/media/files/dikisazenubifaz.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/jefivipi.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/nogokilajew.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/sozifoxadezejumi.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/22563876872.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/8808750627.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/44545853267.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/lanawovobezorududilaxav.pdfIn PDF document text
    • http://charivne.info/images/file/75777681133.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210921050748.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/14654413014.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/dujewelenelokolasekagina.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136c0d502788---22955210505.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614bc5f8e60e6---56459296586.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/fawinitoxebikoruxotikejax.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/tulaveseda.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/34532345970.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/48490466029.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/63668377183.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/63798426709.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/30877914262.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/zejujiwes.pdfIn PDF document text
    • http://scoutpate.de/userfiles/file/2295919118.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/pedupogoge.pdfIn PDF document text
    • http://belst.by/upload/file/xuvazeforivemubumakov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=transformers+forged+to+fight+mod+apkPDF 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_off0000b3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF6 10956 bytes
SHA-256: 38ea51edf642dc096d59bbae4e8aed9950d47bf2326362a3ea0a2aa3202a0d0f
font_02_sfnt_off0000e4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F6 17548 bytes
SHA-256: 5baa1bbdabb23130c9c7d39b5d12069be96d33d6e16566728dc8916faa379382