Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0ddcc027f4e63c0…

MALICIOUS

PDF

84.4 KB Created: 2021-09-23 13:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f1c16cd6fb8dfe15a60bd73f783f9361 SHA-1: aed9e944638a37167462d9c3bce442c056ddd6ec SHA-256: f0ddcc027f4e63c0c07ece9aa85a0e165fcf5577b0b9b749cc99bba11e1e8c96
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document 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 URIs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://chcial.ru/uplcv?utm_term=my+wifi+is+not+showing+on+my+phone PDF link annotation
    • https://braindevelopmentmaps.org/userfiles/files/jojeki.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/10644627442.pdfIn PDF document text
    • https://0900107678.com/upload/file/jusezug.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/miwivadujemuwabotiz.pdfIn PDF document text
    • http://qqsbg.net/uploads/file/39039885875.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/84116117741.pdfIn PDF document text
    • http://africahistory.net/africahistory/upload/files/96111304954.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/77418734011.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/5062514638.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/vireri.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210916003513164.pdfIn PDF document text
    • http://proxima-online.it/public/file/2037065810.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/wataval.pdfIn PDF document text
    • http://analhospital.net/file/files/37369623626.pdfIn PDF document text
    • http://pactolous.hu/upload/file/81497988680.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/pepujutiseraf.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/solizivuzemida.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/kagilofadenuwezifavomujiw.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427742319ea---mukopawikutugidevugixon.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16143518ca15fd---59590444074.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/79636561495.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210917125921.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/pivazofenu.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/4292864782.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_off0000e449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE449 18020 bytes
SHA-256: 304e7d974b40d17add5b1e72538b44e8390bae734f85a2a7744482455066c484
font_01_sfnt_off00011372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11372 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B89 10692 bytes
SHA-256: 1d7dca9f6b76ad714a0e9400d5c33a9d4de7103bfa23bfadcc6c9d6e5fe7c12c