Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cc2cd62861b1a87…

MALICIOUS

PDF

86.0 KB Created: 2021-09-17 13:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 91173e3e478d38abdebd514bbdce1442 SHA-1: dbaea329f481b2be9c3d92ece534b3a057e582e2 SHA-256: 4cc2cd62861b1a87aebdb73edd1348a843c7da3f15a9e6ae040c91b8887b6387
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to external sites. The embedded JavaScript may be used to facilitate these redirects or exploit vulnerabilities.

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://queure.ru/uplcv?utm_term=whatsapp+last+seen+hack+ios PDF link annotation
    • http://trungtamsangloc.vn/uploads/ck_upload/files/53982944087.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/serida.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/26382066234.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/74971502081.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/netewoj.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/ae487ea0e182996ccad70f728995395a/gawumatapelusovegiladusav.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/mirixo.pdfIn PDF document text
    • http://votejoedestefano.com/editorData/file/56294175669.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/23193318173.pdfIn PDF document text
    • http://df-2.de/images/daten/file/wazojapewasawut.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/53748289051.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/40920201686.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210902225040.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021090307353173499.pdfIn PDF document text
    • https://el-tall.pl/pics/file/23019043426.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/41018146744.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/16978757611.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/renijol.pdfIn PDF document text
    • http://evola.it/userfiles/files/91576415758.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6ef294f38---nenurajevoxidoxesefekokek.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/ruzagovopufuzufelanaxis.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/58975389107.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/35499717180.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/moforuselijunipuzemi.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/46711770344.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_off0000ec4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4A 17924 bytes
SHA-256: 6312012ec5d3f8e9794d9d7e0d7ce44c5e37b285ee85a600e04aeb6b4e1e7bbd
font_01_sfnt_off00011afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFE 10456 bytes
SHA-256: 593e2405672db775095754b23a6b5cd861038739c762628667225564074df28d
font_02_sfnt_off000132b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1