Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e94ddf2e723c86b…

MALICIOUS

PDF

71.6 KB Created: 2021-01-13 14:19:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: eb906d357030a40430fd5c7c2773b2d2 SHA-1: 94f32414a66fa867daf73120fae5ad679c4d53e2 SHA-256: 1e94ddf2e723c86b77016670b22caf409b65941a792e21b2cd3b1ba1106f200b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document body, though heavily obfuscated, contains references to 'video editor free online no watermark' and embedded URLs pointing to external sites, suggesting a lure for phishing or malware delivery. The presence of external URIs and link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://trafftec.ru/wb?keyword=video%20editor%20free%20online%20no%20watermark PDF link annotation
    • https://cdn.sqhk.co/zojisixu/gj4jgfL/23648187761.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367311/normal_5f89b3bea4e6e.pdfIn PDF document text
    • https://site-1177663.mozfiles.com/files/1177663/history_of_russian_empire_book.pdfIn PDF document text
    • https://cdn.sqhk.co/kezavilageg/Pciijcn/zombie_world_war_mod_apk_unlimited_money.pdfIn PDF document text
    • https://site-1186874.mozfiles.com/files/1186874/71558752335.pdfIn PDF document text
    • https://site-1177051.mozfiles.com/files/1177051/corporate_design_guidelines_template.pdfIn PDF document text
    • https://site-1166618.mozfiles.com/files/1166618/android_10_for_moto_one_power.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383568/normal_5fdff4a1711f9.pdfIn PDF document text
    • https://cdn.sqhk.co/dojopaxitovi/eOhap9k/photo_editing_background_change_free_software_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/jilanupabopaxukenaredorij.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/36780188322.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/bradford_score_report.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/historical_dictionary_of_ancient_egypt.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/opera_mini_app_for_nokia_e71.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4D 4996 bytes
SHA-256: 814cd3b9b8cf5288c6348bf15c0af4a525f31e9feaf67a17d97a456c667a4af8
font_01_sfnt_off0000ee4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4C 10456 bytes
SHA-256: 68fa4c203aa3838644c22bb82c08e98ea2c6fa9a25aabeadb2b52cf7ba168c5e

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