Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaaa1b696dda176b…

MALICIOUS

PDF

85.3 KB Created: 2021-09-19 08:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 24bd2cdde30bd6183c9aa82f277c9332 SHA-1: 47441fe705661be65edc1440c7bbbc4f041835d1 SHA-256: aaaa1b696dda176b75e5c7549424460e78fae73dec7a4f7c8bba8d9464f94652
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to numerous external PDF files, suggesting a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://bedandbreakfastchia.it/userfiles/file/81786182413.pdf In PDF document text
    • https://laser123.com/geektic/files/gupijufudegefin.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/86676424982.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/vowezusuzezeserurukakaze.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/55289298216.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/magozo.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/19783370169.pdfIn PDF document text
    • http://moneymaker-gold.de/files/31153013030.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090602163473499.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/wugumud.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/27054013822.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/9468581806.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/nosujeko.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/63225371871.pdfIn PDF document text
    • http://africalegal.nl/userfiles/file/66832490143.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/bomatobedetedabu.pdfIn PDF document text
    • https://datajournonepal.org/files/nutezumerimuwujozoxon.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/90697617512.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/lodexisigigetinoxisuw.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/simonepowa.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132ff276836d---9739984012.pdfIn PDF document text
    • https://jensbrode.de/files/file/4528799097.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/18694889484.pdfIn PDF document text
    • https://cv-vezouze.fr/media/file/bikexekagurubu.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/92402991241.pdfIn PDF document text
    • https://yasacompany.com/upload/files/mofemon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=7.0+google+cameraPDF 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_off0000e9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C4 10252 bytes
SHA-256: 0cbfb95f705c5f820c0450b07eb5a1c45d95b2c95bf6a3bb97b6b20655516a68
font_01_sfnt_off000100d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D0 17648 bytes
SHA-256: fc4376a8cf7713acc196ddbf9d5b8891e7a787a6d3f1585b0d5aa3ea3afd3084
font_02_sfnt_off00012f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1