Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ac4f443aa486b2a…

MALICIOUS

PDF

82.9 KB Created: 2021-09-17 19:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d9051fa9e7fc7ecd7243458352386019 SHA-1: 1968991af227d406d35bc453b1e8689242477dd8 SHA-256: 6ac4f443aa486b2a47f45aab455335701297babf4494cc0cfc87d2add1835407
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URLs, many pointing to link farms and disposable hosting, suggests a phishing or redirection scheme. The document's structure and embedded URLs are consistent with attempts to trick users into visiting malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://infrive.ru/uplcv?utm_term=app+android+trovare+password+wifi PDF link annotation
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/98882176632.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/25260600114.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/42461619110.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/2907751908.pdfIn PDF document text
    • https://0900107678.com/upload/file/25819889728.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/97695061388.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/30851108948.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/9787286884.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/sibavajurojozasukufora.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/58758902726.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612f83c29cded---vanubox.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xoxuxugavexigixokoma.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/62421402490.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/36472444512.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/nuvexoguku.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/pufexakoxiwiwogadafes.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16141175098b30---17705603019.pdfIn PDF document text
    • http://tapestry.cz/images/file/files/getuzujumojisetukiduto.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/80146737477.pdfIn PDF document text
    • http://healthywithhart.com/res/file/68068584735.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/75615609197.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/70307975988.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/soninojij.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/xizarisowesevetosupopol.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_off0000dcb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB5 18816 bytes
SHA-256: 47dc15a8c5ab7ccb2517d1e9c91a9d025194375c8f21366666dfdc624fd24157
font_01_sfnt_off00010dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EA 10580 bytes
SHA-256: 034d64ffe8aba364d4865b020223fc6a6c4485a9aad414855ad4b1f5aa00c23d