Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e958ef3f4797aa9…

MALICIOUS

PDF

73.5 KB Created: 2021-09-11 10:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: bb23eadc5cee2d0c7a4a174a50210131 SHA-1: 8198fb20266c4ab26681e7ecb484bd226547d757 SHA-256: 0e958ef3f4797aa9eec52645f2d3ace7747456594f9d38abc223182e0d37899c
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • 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://gifarlcm.com/upfiles/editor/files/56306910117.pdf In PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/76076006750.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/vopukufofulo.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/sojotuv.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/gudawisexutibojoru.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/sedexiso.pdfIn PDF document text
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/ruwunavifavevevozo.pdfIn PDF document text
    • http://valeneighbors.com/userimages/98552019011.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/20219101551519187.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/88149263636.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/40702113363.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/74063047387.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/bozujegi.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/40660141381.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/disedoponur.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/litulareduzegofijikoxik.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210908182545.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/35311089916.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/genemigopixekejodamav.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/lelagiz.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/vadipazetanerotodesejon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=auto+clicker+android+5.1+no+rootPDF 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_off0000b7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC6 18032 bytes
SHA-256: 1c3617477ec1a465cde1ee0d6e554783c9c95d8260a8463cd4ede9d1dc05b65f
font_02_sfnt_off0000febd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBD 10620 bytes
SHA-256: c69495016251da365637f9fb5d206648f0740a02922823196157de6b509fe219

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