Malicious PDF — malware analysis report

Static analysis result for SHA-256 6717b7117016df78…

MALICIOUS

PDF

87.1 KB Created: 2021-09-10 23:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0507975cf0ac45a007b67d42c5ff0b57 SHA-1: af19fb50a9e05e00bf95e96a76a5a773cbaba230 SHA-256: 6717b7117016df782f66e928c0d6684f888f6ccf82506d904c794d11fc75ab11
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host many links on disposable domains, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the execution of JavaScript to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://coretry.ru/uplcv?utm_term=open+world+android PDF link annotation
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/vugomovovoxozapovojoni.pdfIn PDF document text
    • https://mangallagn.com/images/file/40671696422.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/05/17213612284.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/figuvab.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/99485105001.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/xasatelesodudafo.pdfIn PDF document text
    • http://soc-in.com/data/media/files/mudogabigitibepizidobeli.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/nagipotuvepoxinal.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/66754778427.pdfIn PDF document text
    • http://halmar.info/userfiles/file/6424883408.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/kewibagoxosunomin.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/laseragevoti.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/72096778865.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/3382680844.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/f2f210086b7bd3213f664cd0b56a8425/74192620380.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/sokaxorovovelubu.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/31412840377.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/ruxorofenesilovow.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/fupilavuzalenatowimewe.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/338f7a7dc37c8ca50e1928aaa90145f5/99390228702.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/milula.pdfIn PDF document text
    • https://fuoriscena.eu/file/wulowobodusimazor.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/fajupixubupobutusa.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/ritogesijuvegukugire.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/44349103118.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_off0000f20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20E 17756 bytes
SHA-256: 4fe9d9a71567bdc84be46d0b719057a99a75d7a9ebe6b8002d118aac837aab79
font_01_sfnt_off00012052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12052 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13869 10228 bytes
SHA-256: 4c7b58c75530205d0a0a7c76a0a3912fd57e0e38ca0b2b11cd580f89b02b113b