Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb522f4dca8e12ec…

MALICIOUS

PDF

86.8 KB Created: 2021-09-12 15:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ec18a44fadb0143efdc622660ff26eac SHA-1: 4ec5f507d9b7ae1c536e153fea64c3956b42ea35 SHA-256: eb522f4dca8e12ec75aa104ff06cc7b3ec6bb943a0ab5b280165942588c90b76
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or credential harvesting operation. The PDF structure and embedded content are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cructi.ru/uplcv?utm_term=cut+tm+emerald PDF link annotation
    • https://giriconsultancy.com/content_files/files/91353868827.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/jatut.pdfIn PDF document text
    • https://laps.pl/userfiles/file/gesotote.pdfIn PDF document text
    • https://strefaokazji.pl/uploaded/file/mojozurulovifaxolodusim.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/padebovazonobujukif.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/81403985815.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/21677589674.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/dufatokoso.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/72939765903.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/gupikalababosomogo.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/xopopinuvomupapasubone.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/4634922719.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/xasusiganufane.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/4607372757.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/36254671768.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb72a050e7---29247964943.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/94657743145.pdfIn PDF document text
    • https://hoavily.com/uploads/files/pabunoti.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/tunufupaxubaxaxupa.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/8526724310.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/rosituvi.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/wewulotezaxeko.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/1283513594.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/55554396397.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_off0000eba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B5 19720 bytes
SHA-256: ed4ecf9f5a85f37c03dedb41fd30aafdc06947e11e9f653085455024b1f2efd9
font_02_sfnt_off000137bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137BF 10056 bytes
SHA-256: 99f1e9a52c686989dc986223ed9f8db103ea3a33070e3e9c057019821c3dd104