Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f36153a4c69d6e2…

MALICIOUS

PDF

80.6 KB Created: 2021-09-16 02:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 83f871be23e6c5d12cdb1aad1f745d9e SHA-1: 95b95cee05ea746ad6d7b3bbc053ebddcd7546c2 SHA-256: 2f36153a4c69d6e26e291c96e37cf76194bc30f7053dd8dcefc3950ebed44dc5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document is designed to redirect users to potentially harmful websites. No scripts were extracted, but the structure and URL patterns point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://frutapacargentina.com/ckfinder/userfiles/files/56929249290.pdf In PDF document text
    • http://booklandbooks.com/userfiles/file/sazokomarumadivuw.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/dagokexafagutul.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141215e7bb9a---voporagekide.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/27792787866.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/dilikuzakisivugese.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613afd6c78dfc---66719242975.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/83401122312.pdfIn PDF document text
    • http://belniig.by/public/file/fakabujofavapomulijaripol.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/nebiwugilaxerogajoririru.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/53723126145.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/muxutupimimuwafimafo.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/panevuromut.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/83193269031.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/jezaforidatutinoru.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/tudejetevokari.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/sevedadesisotinuwurugokir.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/mukoletepabalolunakesik.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/50149568658.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/12883259813.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/25858335005.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/kigitilikedoresus.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/vitinimowajowesatezorami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=android+enable+screen+mirroringPDF link annotation
    • 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_off0000d623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD623 17636 bytes
SHA-256: df6838c1d0d5c97963d884de2103637c8030046acc072748b967421da67119aa
font_01_sfnt_off0001041c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041C 10736 bytes
SHA-256: 90bc572e79bb20c7d805dda1321207fb8c3bdb99a6327b050559d86ce4b2b465
font_02_sfnt_off00011c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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