Malicious PDF — malware analysis report

Static analysis result for SHA-256 b439665e229a6e29…

MALICIOUS

PDF

82.0 KB Created: 2021-09-13 04:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f0ddeef72e6269d4e6159ab9d2c51cae SHA-1: 0a1bdfc5162f9734eb95b380f7b26458ecd3a637 SHA-256: b439665e229a6e2947e48a2c7a5ef17214c8cf312c775d6ed8078a76ae169cf6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/40745066862.pdf In PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/5679241675.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/76831471693.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613603ad970a9---gevujugiwusilid.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/tonoluzosaxusifa.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/36381520726.pdfIn PDF document text
    • http://foodchemsino.com/d/files/kexer.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/vojujiwotolipimutediwi.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/bivetularoluburag.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/7881674836.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/72426214426.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/2745029746.pdfIn PDF document text
    • http://lagrupacio.cat/file/30624182426.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/basaline.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/vanozumozeragowuxeri.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/pagojisolesanoriru.pdfIn PDF document text
    • http://landia-print.com/pdir/file/betugeg.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/91757039846.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/30459697858.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/zegige.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/kotewarusedemuxob.pdfIn PDF document text
    • https://sthouseluxury.com/upload/files/67472861954.pdfIn PDF document text
    • http://i-tos.com/userData/board/file/45067521534.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/46938934992.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/73276591451.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/gipadujopibepemegerag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=pocket+fantasy+mod+apkPDF 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_off0000cce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE8 23844 bytes
SHA-256: f48db54a64bb7346ae9581e6d9489816bfe4f97dd22d41eb8b0196257035fbda
font_01_sfnt_off0001098a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098A 10752 bytes
SHA-256: 8e4dce0e5470ff8e61623bbbaed851c60ad42908e01ab37f2328d435ebf422e6
font_02_sfnt_off00012260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12260 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1