Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57af7f02f0a2907…

MALICIOUS

PDF

62.9 KB Created: 2021-09-20 04:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 919423952ae43e181de54e11136a058a SHA-1: 7947d634e096ab7318f5be00baf930ad28eafd07 SHA-256: a57af7f02f0a290703f08c2d0fa9c8545310d4e54436f79c7a177bc8da4c8516
64 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to distinct domains, flagged as a link farm. The ML classifier also identified the PDF as malicious. The presence of many unique, low-reputation domains suggests an attempt to manipulate search engine results or redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7296

Heuristics 3

  • 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
  • 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://kommunikator.nu/demo/userfiles/file///tufuxasutogedakatik.pdf In PDF document text
    • https://bloomlight.pl/_bloom/file/nokepigufugazika.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/sakuxududegowurag.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/jomoxiba.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/gasuriwafeteporode.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/zilinitosutetapilavarobuf.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/57053874956.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/vulupazewasijisevi.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/zozakeni.pdfIn PDF document text
    • https://wineart.online/userfiles/file/36601952849.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/pigunex.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/jilumesuvatutup.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/97134413504.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b95fd45db---xogalu.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/vidapatezofaxe.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210910131534.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/93851795209.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/1414605859.pdfIn PDF document text
    • http://falerisztika.hu/tmp/89062847255.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/zawuxorelorixedifiji.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/35220743004.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/63171659482.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/3652ae3594cd1b20cdac63067ace0a0d/91886825869.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/17190348658.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/37487336872.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=android+edittext+set+focus+programmaticallyPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC0 17556 bytes
SHA-256: e185d4313a9da5af5f0a059eb4a73bac8b8a768e6270ede1eb513b7db14cc09b

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