Malicious PDF — malware analysis report

Static analysis result for SHA-256 89fd835ed3f8b49d…

MALICIOUS

PDF

80.3 KB Created: 2021-09-22 13:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: aee5cdf4a6bb7957ed1a6c930fb631a3 SHA-1: 43bd4d1f8a4cca604c4afc98280c75bd11d675a8 SHA-256: 89fd835ed3f8b49d32b15774734b687ab9ba0a056eca839644d0b41bac35e4e8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wastran.ru/uplcv?utm_term=how+to+add+bookmarks+on+android PDF link annotation
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/n9gudbbch0vqbeip4hlv088jbt/75523580399.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/katelas.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/bulumuvesovasu.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161410dc5be468---57752237838.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/sevire.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/titapigafelig.pdfIn PDF document text
    • http://rsst77.ru/upload/files/94880307988.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/42882195330.pdfIn PDF document text
    • http://analhospital.net/file/files/pijaxomiwupavipepejoxuli.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/140634316159.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/23111021096.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/70761746117.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/tagajizazep.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/6952098151.pdfIn PDF document text
    • http://findusafranchise.com/files/files/23141267441.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/vavemepeje.pdfIn PDF document text
    • http://budka39.ru/files/katerewurewibozipoduz.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/16395127547.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109020337477443.pdfIn PDF document text
    • https://cet.sk/res/file/nozun.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/nukejasinivopunonejexufe.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/97147887721.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/sitegiberelebizunelu.pdfIn PDF document text
    • http://gtshotel.it/images/file/kesiseb.pdfIn PDF document text
    • 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_off0000d5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A6 17856 bytes
SHA-256: 5b74f37939709ef0ab965221c77a4325024ea95e52141490a30775f8100e8012
font_01_sfnt_off0001032a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032A 10540 bytes
SHA-256: 34630ee1751255195c8b8898167a1d317bb2d44a842f03977bdcde9dd4346cf4
font_02_sfnt_off00011b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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