Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e3e38ffc3e989e9…

MALICIOUS

PDF

75.9 KB Created: 2021-01-15 07:00:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4debe94a7bdf62369bf2b1511143db55 SHA-1: 7dcc24b34cff5a4882f4afaafcba348dc3af5f58 SHA-256: 1e3e38ffc3e989e942d52d5b5eedb01cb8e03a9569b4cebb74719c856afe6526
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document contains a malicious redirector link and is flagged by ML classifiers and ClamAV as a phishing trojan. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document likely attempts to trick the user into installing a fake browser extension or update to facilitate further malicious activity. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lure suggest a phishing or credential harvesting attempt, potentially leading to the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://gettraff.ru/aws?utm_term=cambridge+primary+review+pdf
    • https://cdn.sqhk.co/xejudawadoni/cvhjzec/bingo_party_food_ideas.pdf
    • https://site-1245906.mozfiles.com/files/1245906/world_editable_powerpoint_map_infographic_presentation_template.pdf
    • https://cdn-cms.f-static.net/uploads/4410194/normal_5fdaff42598b7.pdf
    • https://cdn.sqhk.co/titubebojek/ugdijWs/fimaronenaxomad.pdf
    • https://static.s123-cdn-static.com/uploads/4379240/normal_5ffb2e78e3b71.pdf
    • https://static.s123-cdn-static.com/uploads/4387928/normal_5fe3bbd690037.pdf
    • https://static.s123-cdn-static.com/uploads/4393754/normal_5fc47ec9ebb00.pdf
    • https://cdn.sqhk.co/torujazelome/mge1UoJ/diner_restaurante_bogota_unicentro.pdf
    • https://static.s123-cdn-static.com/uploads/4412387/normal_6000d8e3f01f9.pdf
    • https://static.s123-cdn-static.com/uploads/4385014/normal_5ffbb7dd692bc.pdf
    • https://cdn.sqhk.co/gujadozede/eU5Ypgi/98074249061.pdf
    • https://site-1176433.mozfiles.com/files/1176433/76558485314.pdf
    • https://cdn.sqhk.co/dosakupu/wgcgcic/free_music_maker_app_for_windows_8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec49.bin
0b1aca11007a5ae80f122db845c26fde801d7db66495873dc77e696cc667c551		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC49 5452 bytes
font_01_sfnt_off0000fecf.bin
2f6fe453ff6bbe795fbeb4b2ebc96b58456be363d90c2e90c78e3020ce9773cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFECF 10560 bytes

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