Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc2b57dce4a610cc…

MALICIOUS

PDF

84.4 KB Created: 2021-09-24 01:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 01d89b27478ca7026c0efff67c20e76a SHA-1: 25fc946f9efa75ba2c724fd47502678aa384c1f2 SHA-256: cc2b57dce4a610ccbf78e3cdc4de49c0676d3b1665c55d3831fc07b684876504
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, including a link farm on disposable hosting, indicating a malicious intent to redirect users to potentially harmful content or facilitate downloads. The ML classifier and ClamAV detection strongly support this assessment, flagging the file as malicious and phishing-related. The presence of a 'download button' lure further reinforces the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=nadiya+ke+paar+movie+720p+bluray PDF link annotation
    • https://www.pharmawell.eu/ckfinder/userfiles/files/52184344640.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/46492338257.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/18225757942.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/86849042235.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/5766331229.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/86229288173.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/tarobizafore.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/61017958694.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/4930262193.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/30982892661.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/tipopafenejade.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/mopixozivineweze.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/sezawerapegadugabimomiwun.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/81866810949.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/2459383377.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/22968851690.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/3169724920.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/18821185039.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/pesasemus.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/lipelurenesedisonukebewu.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1614b67931e1eb---63859523953.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/vizerewekivimuviture.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/82810248894.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/4217555340.pdfIn PDF document text
    • 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_off0000ded3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED3 10964 bytes
SHA-256: 7af746e29b0070b0b0c06277cc751a6fcf5e4b87e34f10969866c33db4d65015
font_01_sfnt_off0000f816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF816 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11028 18920 bytes
SHA-256: e242cb386abcc28eb3ef36c002df86a7e4c23e645f7f0a254f23cc2ef8ebc03b