Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a6de4bf443508bf…

MALICIOUS

PDF

162.5 KB Created: 2021-10-07 15:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 145251e88db446d631052f3226e97efb SHA-1: 6cc1ffb9e775a8470cd742a71493fddac71f5b24 SHA-256: 9a6de4bf443508bf3ca28b325b58f1944722c8b4c973aff2d9f9cc70287d6985
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. ClamAV detected it as Pdf.Phishing.Trojan, and ML classification strongly suggests malicious intent. While no scripts were explicitly extracted, the nature of the PDF and its numerous external links point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8c53e7ae4---nurukometowajux.pdf In PDF document text
    • http://vanharteyoga.nl/uploads/files/tedavotibugu.pdfIn PDF document text
    • http://vaynhe.com/upload/files/63437453007.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/403f7258453e9bcc25911456aa28437f/gubafiniwademupu.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/winajosodamemat.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/74791335579.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/15321208241.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/41873376619.pdfIn PDF document text
    • http://micruts.org/userfiles/file/66449078778.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/61793847953.pdfIn PDF document text
    • https://crmsaas.dswip.com/ci/userfiles/files/bixawafunotazukexetoxujid.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/25976600749.pdfIn PDF document text
    • http://hakemokulkiyafetleri.com/upload/ckfinder/files/zugeporilowibufa.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/novafurumiga.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/wunefevekojetosa.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/zodupukewogidexeboru.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/nezezirawikuvobufakoxuxu.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/8421811542.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/bajugexuborep.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/65350699119.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=oneonta+al+drivers+license+officePDF 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_off000214ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x214EC 10560 bytes
SHA-256: 13131339f416f60522f1e50bb9d00efd4b7de94a99f55dc60f363cb03af51ed3
font_01_sfnt_off00022d2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22D2A 20936 bytes
SHA-256: 82f9d9265857f4ad7a3a6377103948e8f21ed5026ba02bc47d74e41a2a3a9dfe
font_02_sfnt_off00026402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26402 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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