Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9e8049bb294b3f2…

MALICIOUS

PDF

77.1 KB Created: 2021-09-22 11:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7c3b7d02dac6ccbf6e06da1914b9eb19 SHA-1: 3aa38794a3070e2e85de6420b88b44fd42e48cb2 SHA-256: a9e8049bb294b3f21c14795d6e30633c99cd6b036a3ef161a3ea06cf08164a30
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=belly+system+forex+download+for+android PDF link annotation
    • http://sportsgarten.com/editorData/file/37800764081.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/dafolenuwujidaxewif.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/bugepuvutokolikam.pdfIn PDF document text
    • http://carszana.com/image/upload/File/wurewezizimekibizowigo.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/momesafo.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c999694220---4444176696.pdfIn PDF document text
    • https://petikdaun.com/contents/files/65918919191.pdfIn PDF document text
    • http://knipia.com/userfiles/file/29273696991.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/75085202086.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/lopujolukodedutidipawit.pdfIn PDF document text
    • http://cudicio.it/images/file/81786408545.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/33501931677.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/zonilosorapebolom.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/40553770964.pdfIn PDF document text
    • http://rrarental.org/upload/file/sigutumus.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/lijozivavuditexurovasemu.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/viwokovafedozabejuporok.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/xosen.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/jelaverukob.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/61907083564.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/mamefidevijereli.pdfIn PDF document text
    • http://helices-evra.com/userfiles/file/fewumarudugubexemefapir.pdfIn PDF document text
    • https://isleo.com/i_photos/file/85001313350.pdfIn PDF document text
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/fumegowena.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_off0000c62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC62F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE46 10872 bytes
SHA-256: eee40ca532cd1d9aa24c4699f2880b57b5a6b75a4bf605337cd575449ace9bf3
font_02_sfnt_off0000f779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF779 18068 bytes
SHA-256: c40d55330b2bb35b296f54c9e0870c524c52c8522add1f2b03414e7de2c52a7c

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