Malicious PDF — malware analysis report

Static analysis result for SHA-256 a563426ec84fdc16…

MALICIOUS

PDF

77.2 KB Created: 2021-09-21 16:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9043ad8d83bfc6fb80444c9eddbb8c27 SHA-1: bdb6112093bfca858292ad62d0343339e2b8e40e SHA-256: a563426ec84fdc16ed26b4f000c6f8af55e56464607126bc36e1eae0069e1876
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, many pointing to potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://foundlight.ca/home/foun6192/public_html/files/custom_files/file/ronamozosabaru.pdf In PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/49021253388.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/tuwamanozufagavojatun.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/kewijagaronix.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/ridagixudipereluzurinona.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148310b66e6f---8788114978.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/34691776939.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/xinaweravuxokis.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-17/20210917174630247008.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/51166376701.pdfIn PDF document text
    • http://biosite.ru/images/news/file/74307404891.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/fevuxubunu.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/lisedaxiwi.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/68315252661.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/dojurupirirawe.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/mofiniled.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/k7tjmg8glr7p66r1nhr2ueq1cg/firudetalejanoxifud.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/81964634054.pdfIn PDF document text
    • http://3m18.com/images/editor/files/34915205456.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/83157682012.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/zalowegutoxodukitovaronax.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/zelileterexodafek.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/jubugiki.pdfIn PDF document text
    • https://forums.androidcenIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+give+sdcard+path+in+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_off0000c731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC731 17808 bytes
SHA-256: cd7a0ef221d286536ecb76dbde31622d6083fc0e43bed3fcde5a3a704cb5ec19
font_01_sfnt_off0000f624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF624 10892 bytes
SHA-256: efaa229931250663b8b4f8e3ee9f6cfc5e11e40963dfadff0700e89ca4a2db3f
font_02_sfnt_off00010f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1