Malicious PDF — malware analysis report

Static analysis result for SHA-256 488697e82ba90d16…

MALICIOUS

PDF

69.3 KB Created: 2021-09-19 10:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eedb67695574a11068bcf707851cd16a SHA-1: 1924b270ed599236d7568b303448a3ea1ccdfe6a SHA-256: 488697e82ba90d1688f08b61afcd3472b745312a427188cfda450a52b7d3adcb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm with numerous external URIs pointing to potentially disposable domains, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and URL patterns strongly suggest a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • 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.
  • 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://dodatnojamstvo.com/userfiles/file/rupowokejetizo.pdf In PDF document text
    • https://samoinstitute.mn/uploads/assets/file/loferoditunepaxizerak.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/25803685626.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/fejitivusawojama.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16138612fa1d78---40065469772.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161300715b0304---77453537075.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/34366337980.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/96977953036.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/69156604931.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/paboj.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/99330009005.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/48187729401.pdfIn PDF document text
    • http://slsnn.ru/content/files/votepefarofogud.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5116619228.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/bonapirukewipabuzipob.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/21606888517.pdfIn PDF document text
    • http://border-collie.ru/sites/default/files/file/topomexujopop.pdfIn PDF document text
    • http://grotech.in/userfiles/file/14540601662.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/13757816125.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/tuwukesozeneguku.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210901211809.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/gavelabiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=gta+san+andreas+free+online+play+nowPDF 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_off0000b23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB23D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4F 14328 bytes
SHA-256: aa5b3bf63144186cad17414d93f6eaf48c21bebb847d029176b5eea6809a1d80
font_02_sfnt_off0000ee53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE53 10728 bytes
SHA-256: ddc616e2ec27777f514e1bfcbba0dbf5ec14803b8d1fdd9c78739107cb6c3319