Malicious PDF — malware analysis report

Static analysis result for SHA-256 98b59b7b5b1d9ddd…

MALICIOUS

PDF

70.2 KB Created: 2021-09-09 14:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d61aa7908b3bba9ffe29d7eaf5aa8526 SHA-1: dacf1b319c7e498646e9403ac8ff1d251c40e7da SHA-256: 98b59b7b5b1d9dddcd882cbd54fe813d25a499dedcd8b54dd91d9db9b965f3d5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external links to other PDF files hosted on distinct domains. This pattern is commonly used to distribute phishing content or further stages of malware. The presence of external URIs and the link farm structure strongly suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130547834e84---piraxudimadosa.pdf In PDF document text
    • http://putzlappenborner.at/editor_up/fisupubixubojutovilutijud.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/68008254712.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/71943580635.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/dezewetorurujebosit.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/7593527540.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/vawatobuvamifugovolor.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/monifebej.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/89798424258.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/fodufinuponuwe.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210904093831.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/fijajo.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/65904590314.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/dosunazamorominiguvoxi.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/678991da5e07582ed4cc8d4bca6a433f/25190460733.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/wetawanakazi.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/75499988088.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/24930438683.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/66843965304.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/33688212946.pdfIn PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/27181387672.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/retuparulexasolinizafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=god+of+war+chains+of+olympus+ppsspp+android+downloadPDF 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_off0000b155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB155 15816 bytes
SHA-256: 1e120f31d5e550f954c5792a293825652017782516cc243b3672cc8262a79aa5
font_01_sfnt_off0000d966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD966 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17D 10992 bytes
SHA-256: 3d6794b9356af5ef21afaf84708080f6ef888990f79e167b8bb63752ea82e0ab