Malicious PDF — malware analysis report

Static analysis result for SHA-256 abe9b3cf09bbf1b1…

MALICIOUS

PDF

73.0 KB Created: 2021-09-26 09:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 577c6856f6491072ee69cdcabd2aa5e9 SHA-1: 3edfd0e66ab296dc71fc0def871d57b3144176a8 SHA-256: abe9b3cf09bbf1b14d4df5651924576d39fc2f562f030751a30cd6f9c2f1ee01
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs pointing to disposable domains, indicating a link farm designed to obscure the true destination. The ML classifier strongly suggests malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests it could be used to execute malicious code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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://profil-metall.de/content/uploads/file/6251798563.pdf In PDF document text
    • http://aaaexpressac.com/userfiles/file/32475899631.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/18370028236.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/55969217626.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/9184669611.pdfIn PDF document text
    • http://coolscape.info/images/files/90309778086.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b580adab99---muzopizafexujaga.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/77041528834.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/jofixad.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/degilonogogemakobo.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/pazoneg.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/wemebetamebowivolexo.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/79688763841.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/rovurawarabikaxarodere.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/tesomijimitinoxub.pdfIn PDF document text
    • https://dukumanis.com/contents/files/25841077571.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/35685416970.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/44278324485.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/73613914195.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/jinividoxekisubijutegopo.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/08bd21860d755f10d32d47fdfc42440b/89281696758.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/lepavoxigulimipa.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/54278332417.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=messenger+android+updatePDF 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_off0000b7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F2 10612 bytes
SHA-256: cf837f3f34272ebe8c6f0bb71569182c144a420a1e9e1fd142bad782f156df1d
font_01_sfnt_off0000d023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD023 18180 bytes
SHA-256: d171c428a59e66782b39b870e69f9f0ce719021151dfd61f3dd73233301d45d2
font_02_sfnt_off0000fe3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1