Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cb0c835d6dd8412…

MALICIOUS

PDF

84.1 KB Created: 2021-09-17 10:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 07cc2545da3c283fb12f55739bddeeea SHA-1: cc5083bdd4c5b0a4e064593cc7b6cf13a3dedbd8 SHA-256: 6cb0c835d6dd8412f89a430ce5d5d5680dd25a7d3277a02fc36cb81ac2ec3c73
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://coretry.ru/uplcv?utm_term=play+store+games+minecraft+free PDF link annotation
    • http://meteosputnik.ru/userfiles/file/lisid.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/ripojoz.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/nufono.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/74373188988.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/waloluwo.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/af3069691c2d9c33ceda248c212ef424/tabarofisudolofakeraxasev.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/94296524956.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/55648434018.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/15359864424.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/74916959355.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/73266332661.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613b629a0f4c9---riwawupibog.pdfIn PDF document text
    • http://theponghop.com/upload/files/mamesule.pdfIn PDF document text
    • http://elpijisystem.com/file/dudedozize.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/rotejidenajixenudepew.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/16385195962.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/17625466565.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/76214675385.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/zizububatukureledub.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/vezemebixefoxarom.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/dovepafevugig.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/vemazuxoniraduriboki.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/zosumu.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109140847107747.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/28659934952.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/45703126880.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_off0000e349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE349 17584 bytes
SHA-256: 023485689155a91c0672795fe71b1ee3d2f76cd8d0dac295559c8f33aef53280
font_01_sfnt_off0001110a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110A 10792 bytes
SHA-256: fb91df77a2696bffe1eee0cf86309f22483f86cb7eaf52fee6b624ec03197b94
font_02_sfnt_off000129fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1