Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe78b9692511db4a…

MALICIOUS

PDF

85.5 KB Created: 2021-09-17 06:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 871664e817297c4eab2e5d980397379f SHA-1: b11eb7a900a44799dbee9e602b6bf4a1fb04b166 SHA-256: fe78b9692511db4ad007835e6277475eb04b123663792fe2fff15fe2820d504d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://jornalespacoaberto.com/app/webroot/datafiles/editor/files/90876927835.pdf In PDF document text
    • https://alev.az/userfiles/file/sodafupagewapafumikewim.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/90049756813.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/94i5in6np9hrp7qa010jdjlrr2/16808623885.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/situpewodizurewodogewuj.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/60118610112.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/35180706805.pdfIn PDF document text
    • https://cuatudongnhatrang.com/uploads/files/jelubi.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/zajidon.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/lavununeri.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210903210116.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/wevexediridut.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/wuzodexejovutisap.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/keguxiferotufanalavegon.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/dasox.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/9256349624.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/37256970242.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/70918586338.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109140837078492.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/ripugezufukugenezizifo.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/fagokupixuru.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161352074c7293---mulonilosuzebuzikujeto.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/41482998629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=billoo+comics+pdf+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6E 10820 bytes
SHA-256: c468c60aebab5ada8a90878c31a0c3139588795a32905ee6dfd8a8252f253365
font_01_sfnt_off0000e466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE466 16508 bytes
SHA-256: c5fbe2e553cf8e8231c57d703af049c63dffd38cd2d61d57177651859c8502cd
font_02_sfnt_off0000fb54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB54 20152 bytes
SHA-256: 5430077cd730fb87f57d4893924844fa8600a90bb5cc8bcbde07c8a7dd3af50b
font_03_sfnt_off00012fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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