Malicious PDF — malware analysis report

Static analysis result for SHA-256 87096f282f8f0b4b…

MALICIOUS

PDF

85.0 KB Created: 2021-09-19 18:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e4c0162f420f8cee56e57f37a7d4b0f9 SHA-1: 6f2a49e9e2b93feec1ace40e5521bc12fd06cc18 SHA-256: 87096f282f8f0b4b8caedc50f6ec6256b71bacf21a9e865dff623ca8dbce6098
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it employs a social-engineering lure to trick users into installing a browser extension or plugin, likely to facilitate credential theft or further malware deployment. The document also contains numerous embedded URLs, many of which are associated with link farms, suggesting a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 http://xn--or3bi2da319p.com/upload/fckeditor/file/76630367790.pdf In PDF document text
    • http://bk-plus.at/userfiles/files/44520116692.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/rijukuzobakulafi.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/60572734509.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/b13fe1f521899569a7afe56b4f4fb69d/24568519330.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/jifumikakavutubowapojafe.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/28602921156.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/zabobigov.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///bitezalixuwodipamugumoma.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/35099937296.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/10447750695.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/87147791183.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/lewavepubojilonipamabet.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/10869547053.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/4737832324.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/gazetagejuwufurijuloz.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/xupuzux.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/patuxuten.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/bujivonurunuwoxa.pdfIn PDF document text
    • http://spiregene.com/image/files/20210911_201815.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/pupiterupumu.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/ribodumojeletedixide.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/navixeposevigafiradej.pdfIn PDF document text
    • http://bptramptour.pl/files/file/89125162986.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2e884c46b---99436386564.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=adblock+browser+android+tvPDF link annotation
    • 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_off0000e6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF10 18204 bytes
SHA-256: 1135b3ee25e8fa5ba2eff18523789e6bf85904f08df6b3932d8befd5f4854cef
font_02_sfnt_off00012d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D50 10728 bytes
SHA-256: 1dce2bdb9908b241064b8cca73a2efbaac3b9d9d18623fe8ba1a89fc8bfdc85d

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