Malicious PDF — malware analysis report

Static analysis result for SHA-256 d48f2e3061735c31…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 16:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9430ffa1b593d360f956b61b8b6568cd SHA-1: 90ad6a91c7e91f4802591557ac68e4baa1b29fe5 SHA-256: d48f2e3061735c31db54342adae9d35624c28de38674c23f55ba34db40738325
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm, likely to obscure malicious destinations or increase the chances of a user clicking a link. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://jsqnchem.com/upload/files/xemowetelokizijudajako.pdf In PDF document text
    • https://activepymes.com/pub/file/272578151.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/gobifibaga.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/terabetamafuwume.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613551428ebf6---37958694254.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/86042493744.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/3021894381.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210913_7DD8222BAC8BA44A.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/movej.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/fubasosijim.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161377c2e1dcbb---pajimexulaxite.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/99407753439.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/vodomaxagowu.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/laxuv.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/5109287455.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/medorisunitemekivuwakew.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/fezugujojejepovimaziloduw.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/65808876157.pdfIn PDF document text
    • http://uhorder.com/upload/files/5279088828.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/jadakinosabedelorabolulo.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/gijepavenavadeluvit.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210905141236.pdfIn PDF document text
    • http://machulski.com/public/file/5598778115.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=exchange+server+instellen+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_off0000d623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD623 18744 bytes
SHA-256: 8cdd53d5d8a3e1c29d8eced01b28aa7db0227eae7b607d9dd202a6066523bf2e
font_01_sfnt_off000106cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CF 10800 bytes
SHA-256: cf5d3d246c76ec3d78b7d0856340fd33457e9cf018a40a3a966b453a197012e7
font_02_sfnt_off00011f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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