Malicious PDF — malware analysis report

Static analysis result for SHA-256 999e127aaab8728c…

MALICIOUS

PDF

68.7 KB Created: 2021-10-02 22:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7ccc76040ae0803e498db88e6e93cb6a SHA-1: 353ca116619246ac3fb2584dce6dd4681eaf0588 SHA-256: 999e127aaab8728c3fae7b97c136a91c634488d8df2962d8430a32a78a849c74
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous unknown URLs suggest a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://flardochform.se/userfiles/file/nudujopopadobudariw.pdf In PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/e140db2b6e5de03e6a57ac1ae44ad0e9/1610600598.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/fivuwiwumunexumasibofono.pdfIn PDF document text
    • https://combrooncom.com/contents/files/bogesujoxinomunun.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/kanowodena.pdfIn PDF document text
    • http://e-sheremet.com/img/sajoxesefejifalakavaso.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161320681bd213---63859919138.pdfIn PDF document text
    • http://zlato-eu.cz/upload/files/52920724452.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/numuzozimumubebamajulanim.pdfIn PDF document text
    • http://kbfrutos.sk/images/_file/pejakosagaxabirukibefo.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/pipureleza.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/47887986365.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/demobaga.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/nekemagufije.pdfIn PDF document text
    • http://alvitraders.com/files/33753901436.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/09/18179873117.pdfIn PDF document text
    • https://www.alliance-educationsexuelle.ch/ck/ckfinder/userfiles/files/55591710458.pdfIn PDF document text
    • https://asp2.aiwangyun.com/ckfinder/userfiles/files/79108017242.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/67470404025.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/12462654865.pdfIn PDF document text
    • http://bibikid.ru/upload/34360108805.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/73730353752.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/70314345742.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=online+thesis+libraryPDF 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_off0000afca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E1 10364 bytes
SHA-256: e152caca3cfbd8fda126b8a7e358f08fa342a003e9321e660fb146e908efc4df
font_02_sfnt_off0000df4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4D 14972 bytes
SHA-256: 490b3ddad91a1dd1cb3af5910e066d72cd18f21694df56bdc61082a373c8de80

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