Malicious PDF — malware analysis report

Static analysis result for SHA-256 700ea7d68e8b264b…

MALICIOUS

PDF

82.9 KB Created: 2021-09-16 06:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d32e2abe208916b35c15c296abc4fd9c SHA-1: ddbcb624bcaa2f08cb3731b9a52122b52f30b05c SHA-256: 700ea7d68e8b264b85516f4f75aa411732fe8cfb25ef7faaf138feda6733c339
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document uses a cloud document lure, impersonating services like SharePoint or OneDrive to trick users into accessing a shared document. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the redirection of users to malicious sites via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://inwebjor.ru/uplcv?utm_term=how+to+install+airdrop+on+android PDF link annotation
    • http://stmrcstvm.com/userfiles/file/54562362568.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/legeg.pdfIn PDF document text
    • http://adriennemason.com/assets/files/lifamolelivufatozasusa.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/3553525181.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/dimogisuvofujamujonal.pdfIn PDF document text
    • https://ismart99.net/upload/files/20389051854.pdfIn PDF document text
    • https://comfort8889.com/upload/files/wawawudidiwisemebobili.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/56288684819.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/bumipotigudevumuxosigi.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/27792787866.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/73589478899.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/12968989720.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/wumijaruzegatigufesemelil.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/gaxuxilo.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135fd5c3102e---16124978944.pdfIn PDF document text
    • http://runhouchem.com/upload/files/selipegezevili.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/wanekozivexogevejeke.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/70204990206.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/gavika.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/26628227913.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/97271996898.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/15651487887.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_off0000e009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE009 17832 bytes
SHA-256: 6461df8d7b0a32e1839946f3e3cf1ec91239a574e12fd60b2925d022492b7351
font_01_sfnt_off00010ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BD 10332 bytes
SHA-256: 574c661538e189efc5e14dfc02f090fbfc2bdf004184101c9879abd51f246e5d

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