Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d7976f19dbb6340…

MALICIOUS

PDF

69.0 KB Created: 2021-09-17 02:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a9da949422f6e5ab11e405d16944e91c SHA-1: 0c1443189dd09e9a34bfbc4f7880305b24c25437 SHA-256: 2d7976f19dbb6340f73f2b7dc4863fd156a5574a0e4b888067345884edb7addf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution scheme. The ML classifier and ClamAV detection further confirm the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=tutorial+membuat+video+alight+motion
    • https://ximangcampha.vn/upload/files/10225955526.pdf
    • https://techinnsrl.com/writable/public/userfiles/file/48300607609.pdf
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/wixeba.pdf
    • http://proreferee.ru/uploads/ckfinder/files/gojuxojirutew.pdf
    • http://meruzhankhachatryan.com/app/webroot/files/file/98614732783.pdf
    • http://www.aragonemprendedor.com/userfiles/files/zonitavokekelifopupefuno.pdf
    • https://educationindiajournal.org/ckfinder/userfiles/files/32257146739.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/3cdd2f5785ed697e037e2c1da1a5197d/bigaramogolezifofirakufad.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/0f09e925aac4dc71a4cc821ee8f8cbe5/48256561988.pdf
    • http://www.urbanwaterways.info/files/26629303170.pdf
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/81066014509.pdf
    • http://educasters.co/ckfinder/userfiles/files/2737756739.pdf
    • http://sbkf.org/files/files/fefur.pdf
    • http://www.oomewatersport.nl/upload/files/55935104173.pdf
    • https://ctapigroup3.com/contents/files/rutosa.pdf
    • https://nhomphuongnam.com/upload/files/xapefukesatezexaj.pdf
    • https://nistd.in/userfiles/file/81234725727.pdf
    • http://xinshifm.com/userfiles/file/jozamifufawaj.pdf
    • https://ww150001.linebot.net/upfile/files/20210910104337.pdf
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/25131258070.pdf
    • http://chukgoobok.com/files/fckeditor/file/45093987018.pdf
    • http://iseveranscopy.com/upload/editor/file/repofitudovosabug.pdf
    • http://cosonhuath.com/hinhanh_fckeditor/file/99147985750.pdf
    • http://shriadinathbank.com/uploads/forotoxasavog.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aec3.bin
896a62c5949e34d08ef3cf17af50bd89166cac60f5283e1db226ae123a9c2fb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC3 10796 bytes
font_01_sfnt_off0000c72f.bin
c7d05c2b3f3a752a28d343ab760a2bf1911eaef2bae90b6f6234eeac1f5b265e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC72F 15808 bytes
font_02_sfnt_off0000ee97.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE97 16792 bytes

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