Malicious PDF — malware analysis report

Static analysis result for SHA-256 90e8316a1ff16bac…

MALICIOUS

PDF

71.5 KB Created: 2021-10-02 09:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 12061c20c41cd284cf97f15d4971b1b3 SHA-1: 87053aa44c590cd04c95a717353dc0e93efcf0a7 SHA-256: 90e8316a1ff16bacfb494dc62e75194f247e135b4eb74e919424f7b93fad5aa9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://saigonservices.vn/images/uploads/files/5286286988.pdf In PDF document text
    • http://rogersdesignhouse.com/uploads/files/63674167103.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/mulumalijufaxog.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/nulelebomanir.pdfIn PDF document text
    • http://asid.rw/userfiles/file/20247448308.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/wofitatekewiwatek.pdfIn PDF document text
    • http://esistore.be/userfiles/file/10201532051.pdfIn PDF document text
    • https://medius.sk/userfiles/file/vusoxesagaroruvodomegex.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/levav.pdfIn PDF document text
    • http://beta-rc.com/upload/files/mikegudewamom.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/vepisamivufik.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f7a6d6d064---47689970629.pdfIn PDF document text
    • http://youil.org/userData/board/file/zasepigutesafirexomag.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/totafivefoditigutevone.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/10405269912.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/veledo.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/49917667398.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/janopineburuliraxege.pdfIn PDF document text
    • https://spyboarcams.com/files/12066299488.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/pitosivat.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613b08fd04d2b---1798264649.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/63004219012.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/37311912012.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/12601468939.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210926081458_ncji55.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/41949445515.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=got+my+toes+in+the+water+songPDF 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_off0000b2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A9 10748 bytes
SHA-256: a8199147de1a36475e147942c6121f7719a6edd7fb8d44753699762ed5c13976
font_01_sfnt_off0000cb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB58 17600 bytes
SHA-256: 7d26c2553aebda7b401ba98b4ee9f59c9ace343ccbcc7f8f7fa6974a97bbaef9
font_02_sfnt_off0000f862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF862 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1