Malicious PDF — malware analysis report

Static analysis result for SHA-256 c62af3d64bfae181…

MALICIOUS

PDF

82.9 KB Created: 2021-09-15 18:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1b031df2e4caace10921608b77bce134 SHA-1: d3bc029b3a93d37615cc23b9a34498059159282f SHA-256: c62af3d64bfae1812305f45b0d4d5da012f91fa51e3a1a48c73bee302222aba9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. Heuristics indicate it functions as a link farm, directing users to numerous other PDF files hosted on potentially disposable domains. This suggests a phishing or malware distribution campaign, with the embedded JavaScript likely responsible for the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://galedo.cz/www/data/cms_files/files/67132257458.pdf In PDF document text
    • http://mrybalko.ru/files/pukedebijatixogon.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/loseresed.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/rubujepuremekafeko.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/23100915561.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/14224439685.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/53233104821.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/juginig.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/6878626525.pdfIn PDF document text
    • https://g-stampo.com/pics/pages/file/77526373140.pdfIn PDF document text
    • https://drlanda.hu/user/file/3985824437.pdfIn PDF document text
    • http://garderoba.sk/images/_file/kuxigep.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/df86a8ef3b9e7fdaf8c766582d5f4815/93426419084.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-14/20210914082231684253.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/kuzivivotufuselujur.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/pekinuwizegexexonaj.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/foseraxibawo.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/50648594249.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/jovotinuwenixuvi.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/72528123899.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/tibotetilukamamu.pdfIn PDF document text
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/83429401700.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb494b663e---81651685394.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=android+developer+challenge+2+winnersPDF link annotation
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/5409825590.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_off0000d895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD895 19852 bytes
SHA-256: 3f4bf22ef2e1c51e1407b0790e1f0ca11be61b3680c791a22f899ae0b0213331
font_01_sfnt_off00010c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AC 10948 bytes
SHA-256: d09553e702cbc0456622db7ca282b8013140a1ca66836561cbc0c583e8a8ed21