Malicious PDF — malware analysis report

Static analysis result for SHA-256 6983f1f89e614d10…

MALICIOUS

PDF

81.1 KB Created: 2021-09-19 03:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 623a38e054bc94c95997d534600388b1 SHA-1: 3e515f11981d2c0d2fdff1d4fd517afd9a93640d SHA-256: 6983f1f89e614d104e6aa0abf1ee8a319dc14bee7e9e61884b2d9a4632932fd1
166 Risk Score

Malware Insights

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

The sample was flagged by a ML classifier and ClamAV as malicious, with a critical heuristic indicating a browser extension installation lure. This suggests the document's primary purpose is social engineering to prompt the user into downloading and executing a malicious payload, likely a second-stage downloader or infostealer. No scripts were extracted, but the PDF structure and heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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
  • 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.
  • 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://teleinwestor.com/userfiles/file/92686385113.pdf In PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9dbd89a3a---tukufixufemexosukeg.pdfIn PDF document text
    • http://freestyler.cz/img/file/99162442238.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/jawoxotujojor.pdfIn PDF document text
    • http://smartvoicesys.com/userfiles/jisinofesazimedadajadomeg.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/xeseludegivavezefuxos.pdfIn PDF document text
    • https://seger.cz/userfiles/file/nunotekubenopafapavemilil.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/88158936058.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/8614456334.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/31744251180.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/68681045592.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/scivj5levffisg2r5g79vubof7/34673179745.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/paxukuzewisenozaxugexori.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/75951541640.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/81593787545.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/subifezoraserer.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/68990413053.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/23279346005.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/68213762767.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/voniwikopikuvek.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/48838162782.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=ptp+photo+transferPDF 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_off0000d829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD829 18712 bytes
SHA-256: eb2475625402f0526a0445be7a1693516d58bf80c70ab85971948816c5eb226c
font_01_sfnt_off00010843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10843 10316 bytes
SHA-256: d3116005847e363e3a3312ac00c3499a1e3873d72ec8b12c664728988c574fd7
font_02_sfnt_off00011f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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