Malicious PDF — malware analysis report

Static analysis result for SHA-256 017058c37100c180…

MALICIOUS

PDF

71.2 KB Created: 2021-09-20 20:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cd7f2f45f9409246a1279067076bc94c SHA-1: 7983eb177a5529fd570e32d1438a94d8ff8a3a2b SHA-256: 017058c37100c18075f24890aacc9b88f383bf90b0aaa87599fd4a31389d9d22
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains an embedded JavaScript stream and numerous external URIs, one of which is a disguised link pointing to a Microsoft login page. The presence of JavaScript and the nature of the embedded links suggest an attempt to phish for user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://palestraarkadia.it/userfiles/files/76416107789.pdf In PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/38512832803.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/pejitipunolifogemetizi.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/nopuvivadepifev.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/puvironekekamave.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/xixaxakejoboxo.pdfIn PDF document text
    • https://servicio-mexico.com/images/file/birefuloz.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/jitukuwejujolaxegowoxode.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/58470918895.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/kubesuju.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16142e8ca07fbc---belijugu.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/tutexijivujufosefemudido.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161355cc19cadd---vasaritoxowamonuxoteso.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/49351443803.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/manunawinijidi.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/88840123560.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/lolixijowatexivix.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/dumiwavo.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/41866022957.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/54265337361.pdfIn PDF document text
    • https://loctra.net/userfiles/file/50917335668.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/2864427456.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/rasuzovolebosufomuloneg.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/pijub.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090809253972.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=microsoftonline+login+sign+inPDF 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_off0000b8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F7 10344 bytes
SHA-256: 1261932320548efe85211bbdfea1cc2c6655bc7125b431a921ae9f44a32304bb
font_02_sfnt_off0000e86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86E 15100 bytes
SHA-256: 326245ee764a60e45db3cae08213e3cf89226ec06e3cb421364270817ef295cf