Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd07d6d1e78868b3…

MALICIOUS

PDF

87.7 KB Created: 2021-09-18 01:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 294c9a9938b7160d1347d44662022da0 SHA-1: 8444394a7deccd169d41b47e9274a59c405054a7 SHA-256: fd07d6d1e78868b36703dcea402ef40f21be5678bf4ad219e7a19ca24b3eac7a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF contains a large number of embedded URIs, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of numerous links and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://catamma.ru/uplcv?utm_term=words+with+v+at+the+beginning PDF link annotation
    • http://windowsplusllc.com/ckfinder/userfiles/files/74810557035.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382976a22c5---72286397076.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/rewavovasokokoporazu.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/77955023939.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/lolenegowigivufiwobiza.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/bubixi.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/42513115492.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/25895112196.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/sidawokiweruzunupapi.pdfIn PDF document text
    • http://grandfiltr.com/files/file/gedofamemepujazufifiwut.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/98390960109.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/73174743938.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/3344054909.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/37871283317.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/vatonijelowafi.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/528454055.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/fesuvavas.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/dibafemuxe.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/80944002642.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/muguluje.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/nitinimoniloxosarukix.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/jomatusegefose.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/57893612710.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137358722567---38524304715.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_off0000f34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34D 10764 bytes
SHA-256: d2a393f44ccc5ca61a9e57624e9afaef78b8ace657b932dfbabaa66ec490c5c6
font_01_sfnt_off00010bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDA 17348 bytes
SHA-256: f4288270240b3a183465e9db14cfebd12f7f639f34c7299063d4679ce488b92d
font_02_sfnt_off00013943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13943 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1