Malicious PDF — malware analysis report

Static analysis result for SHA-256 def367b5b37d8a06…

MALICIOUS

PDF

71.5 KB Created: 2021-01-21 02:49:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0f389ab22b324c22931cfd611b1f6778 SHA-1: 7b93260d6dc5947d4f419c829cc86da7c37b3609 SHA-256: def367b5b37d8a063142347de418f16069a0d030d014bfcf935a879dae8b1183
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to known malicious redirector infrastructure or disposable hosting. The primary malicious URL identified is https://cctraff.ru/123?utm_term=alien+periodic+table+worksheet+answer+key, which is flagged as a malicious redirector. The document's structure and content suggest it is designed to lure users into clicking these links, likely leading to phishing sites or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://cctraff.ru/123?utm_term=alien+periodic+table+worksheet+answer+key In PDF document text
    • https://static.s123-cdn-static.com/uploads/4470540/normal_5fc5bc6cd96e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408348/normal_5fbd6a99adb6c.pdfIn PDF document text
    • https://cdn.sqhk.co/vujagefamig/iaQiiTX/smart_car_price_2015.pdfIn PDF document text
    • https://wugovaxovagebi.weebly.com/uploads/1/3/0/9/130969592/jupolulupaxaze.pdfIn PDF document text
    • https://site-1178101.mozfiles.com/files/1178101/spontaneous_generation_and_biogenesis_worksheet_answers.pdfIn PDF document text
    • https://sekikeke.weebly.com/uploads/1/3/4/7/134739811/909662.pdfIn PDF document text
    • https://farejebizaf.weebly.com/uploads/1/3/0/8/130815013/tunaju-fotiwa-loxejuxavumik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445890/normal_5fd7eef96b101.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424666/normal_5fd1fe8c56ee1.pdfIn PDF document text
    • https://site-1200133.mozfiles.com/files/1200133/8375667287.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/cE8ijgc/play_free_online_games_earn_to_die_2012.pdfIn PDF document text
    • https://cdn.sqhk.co/tavikebepo/Tgjq9Zu/62452909394.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404983/normal_5fd125dcc874d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393349/normal_5fb4fa4ebda65.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453560/normal_5ff29110134ac.pdfIn PDF document text
    • https://cdn.sqhk.co/vakanaju/ghwgilJ/disney_account_login_issues.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AD 5548 bytes
SHA-256: 9f7e669ead85bab375e59dd1cb66c508166d7fc0202ee6663990fd063df0f4d6
font_01_sfnt_off0000ec8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8F 10800 bytes
SHA-256: 88062f43c92a451c22db2fc994d5e5b1ffd4625a2a9ff43652e9d8f00606c057

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