Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb1d3352ec386dd7…

MALICIOUS

PDF

91.3 KB Created: 2021-09-11 15:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b545b1b07f654f73985cf7e9b5e81aa6 SHA-1: 46472d7a70199a7a2c92849920c15f8cfe5b3864 SHA-256: fb1d3352ec386dd74e6c8c172b7f7e88db4060aedf069243a8a3eb13e0921e0e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, a common tactic for phishing or distributing further malware. The presence of these links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://steakpluspizza.us/userfiles/file/disilemedabo.pdf In PDF document text
    • http://fusiongrup.ro/userfiles/file/fesegabidofux.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109051322441296.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/96671201441.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/japuraxuxatududofa.pdfIn PDF document text
    • http://www.pvvc.cz/files/lifebenewoxatexedageg.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/99748201074.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/79589790082.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/wibawudisipadulaxu.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efda8e079b---25052343849.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/rosonasasebiganosesamo.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/21709532086.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343089f1809---fuwifaromiwexefuluvo.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/47778679758.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/kagenetovadusivodagafati.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/sofagarimesenedigula.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vofawisapanutigewunis.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/buxurokowaxasafezimofu.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/18945016678.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/sakuzupar.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/ponetasopupukudij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+new+mutants+full+movie+freePDF 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_off0001025a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6C 17228 bytes
SHA-256: 207442a2978b34ca29b5c8c70783472878aa79167dcabe6cca0375c0ddef0e4e
font_02_sfnt_off0001471a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1471A 10696 bytes
SHA-256: 5fb7f5e6ee8dc287a39ca11c2ca41914897cb059b5341835d5353c07090bafa8

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