Malicious PDF — malware analysis report

Static analysis result for SHA-256 f003efdbbb58ac76…

MALICIOUS

PDF

78.4 KB Created: 2021-09-19 13:35:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c3cd2c0ae7391ec8c185324fab2685cb SHA-1: 0a43e136f04672171ab4c6d0cdf4a784d106544d SHA-256: f003efdbbb58ac76a39f8c399334bb0ee66f4ee1dddb51ae30e1e84c7319de33
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, with a high ML classifier score and ClamAV detection indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed to host many links on disposable domains, likely to distribute malware or conduct phishing. The embedded JavaScript is likely responsible for executing malicious actions or redirecting the user to one of the listed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://biznesfishki.ru/files/userfiles/files/sikiridobibazeso.pdf In PDF document text
    • http://sooam.com/files/fckeditor/file/14391341046131f95e7c369.pdfIn PDF document text
    • https://clinicaalcantara.es/sites/default/files/userfiles/file/regewamudufubefi.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109110043515304.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/zuboxoro.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/nipipag.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/90821994214.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/76625295226.pdfIn PDF document text
    • http://potya.com/tajakepirokifuzulogalib.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/64520851506.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16146accf94d64---10544605485.pdfIn PDF document text
    • http://fnathservices.com/upload/file/57523515959.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/lurumexumoja.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/gerisifadekawavakiviruzur.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/70392846702.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/ziziwululovogupefabeko.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/zelufonesabuzabijazevu.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/31130818654.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/24528436658.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144434cda85e---44307888925.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/51453519544.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/lekomiwo.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/67448882806.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/ripaxazugabugupafed.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/zeremanivinarame.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/88162636538.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=louise+hay+101+power+thoughts+pdfPDF 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_off0000ceda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDA 16924 bytes
SHA-256: e2a32fc013eac36a1cfdbc268b45024fcb9bd62ac5eeefdf4111a3b3ebc838bc
font_01_sfnt_off0000f978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF978 11060 bytes
SHA-256: 69874b33f4bad08d3dde3e4af3f11b24a17c96d5d221c6d56d266e34c1fa35f9
font_02_sfnt_off00011356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11356 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1