Malicious PDF — malware analysis report

Static analysis result for SHA-256 75b6b61a9a2739e8…

MALICIOUS

PDF

74.4 KB Created: 2021-09-13 11:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a495ff8f2e9e42ad177c343c5259fd68 SHA-1: abc2f39c3a6c870426b9bfce7536b2015ed0da5e SHA-256: 75b6b61a9a2739e8eb10c9ec4488bf17ceeadab3ff75a6d90b6293c00c25ff2e
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by an ML classifier as malicious with high confidence. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of multiple links suggests an attempt to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 4

  • 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://rcp-ranstadt.us/files/2639434282.pdf In PDF document text
    • https://vasantviharproperties.com/userfiles/file/lusal.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/58596046615.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/barujidibixodon.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210903043146127.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/kevekefoza.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/74460683529.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/walanoluduvo.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/loruzavajukarawejufijax.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/tuzujesisojuxepime.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/19540454984.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/wozositigokanu.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210906121748.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/lawokijijinekopedavos.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/34898853593.pdfIn PDF document text
    • https://kimcert.com/E/file/tufowiwob.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/341459630f4613b50ed222673b7a0a2c/11241776215.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/wukaxilutasafa.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/bugavamilewolibi.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/8v48cs0l6da884jjne8dhc40t4/naduguxurozoka.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/jakijafarisa.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/musuzanemunilorowivub.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/wudufibazijofafofexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=sign+in+outlook+accountPDF 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_off0000c15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC15E 16924 bytes
SHA-256: 8e5e12067d1f2ded47e3633d3598a503946c5f6d0a86f2ac9262f7811c2df2e4
font_01_sfnt_off0000ecad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C4 10272 bytes
SHA-256: ef75f9034f5c00daa2545b3122f617f00fdd330e526688a2ae43de6641290273