Malicious PDF — malware analysis report

Static analysis result for SHA-256 b06c6bfff3af97e0…

MALICIOUS

PDF

69.6 KB Created: 2021-09-18 14:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dc087af962a428e0cfdc78abe7d56424 SHA-1: 07990db492e4a1d9492130f37bdcab1c80039474 SHA-256: b06c6bfff3af97e03d202ec53d924fcdbbf2a8f79657ebb20f4465087fb4078f
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded links, many of which point to disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://rosebankprimary.co.za/inc/ckfinder/userfiles/files/70393054677.pdf In PDF document text
    • http://inspeq.eu/public/files/98150964922.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/xamavutemopasifusibul.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/64003816871.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/90454025709.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/sofazowap.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/71141368607.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/begex.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136dc5596b98---8271091173.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///zajaguli.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/86716068327.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/36645601178.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/mafedogaten.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/witilegotunaxefiradakif.pdfIn PDF document text
    • https://la-klamm.org/Files/files/99286403848.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/65170936895.pdfIn PDF document text
    • http://hingliltd.com/userfiles/siferapotivavigejog.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/gijirufoxudigoso.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/31018511711.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/73597594423.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/qoitt593gj1ghskpdmlc4j88k5/xupejatosa.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/suwejabepizuzo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=bully+full+game+free+download+for+androidPDF 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_off0000b19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB19B 10784 bytes
SHA-256: 82a298ace8a513c92dd61edc609a88f8e0d2c85a2bb90650f0f88a0fd8ca7b82
font_01_sfnt_off0000ca3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3F 15200 bytes
SHA-256: ff0f489d464e70a18abd90373007dc417e0e9bfce2b84fba0b01cc031bf53eeb
font_02_sfnt_off0000f0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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