Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f11e5888220b56e…

MALICIOUS

PDF

67.6 KB Created: 2021-10-01 18:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 838bc6e63cea74b4115747b12c602330 SHA-1: 4c80c4b53008db592d8bc511d114c93aea2fc0f2 SHA-256: 3f11e5888220b56eb400463196d0bf467bcf09aafb4d4046ca60a1c82bd40500
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to potentially malicious websites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggests a phishing or malware distribution scheme. The ML classifier and ClamAV detection further confirm its malicious nature, likely exploiting vulnerabilities or delivering a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://laborke.ru/uplcv?utm_term=pk+xd+unlimited PDF link annotation
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/kebesafo.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/46681040610.pdfIn PDF document text
    • https://ikorti-iao.com/userfiles/files/gawominasugupavo.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/fesevotutufudomeravoka.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/kumovudosavenapanolojoju.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109010853001800.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/feroxafogudejozarifawibi.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/durugeropawapasedukenek.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/15320659729.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/jamuniluxusewibade.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/juraxugifux.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/nesar.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/devosagekexapupuban.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/fevos.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/161399918f0962---bufewerovajaku.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/rulego.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/pizikum.pdfIn PDF document text
    • https://xn--q3cceuw0c6ab0d2ii.com/upload_file/files/rojekeliwaperatugomexuk.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/14578815485.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/nelunabegaki.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/45998722106.pdfIn PDF document text
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/64937796304.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_off0000acf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACF6 10152 bytes
SHA-256: e07ed71d57be6a305c95b20d21006dc2f4dc5bf895b0d39490d058f10e53dba3
font_01_sfnt_off0000c397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC397 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA9 14924 bytes
SHA-256: 316cfc418fb3a47d3e07a1268484d36c9a51d4fb75f7323b2e0e6353f6bb857d

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