Malicious PDF — malware analysis report

Static analysis result for SHA-256 d65bb0f6785b36b1…

MALICIOUS

PDF

73.3 KB Created: 2021-03-04 03:07:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 55f44ff1d1f2662bda54d5b1868cadb3 SHA-1: 8beefca29a5bcfd186c5db9b6a71a9c8da32d286 SHA-256: d65bb0f6785b36b15d28df5dc477bdf2c1db2eec3eb90fb2d9e2531b7dedf14e
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing indicating it points to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were directly extracted, the nature of the embedded links suggests an intent to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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://dafemum.ru/wix?keyword=all+of+archive In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408343/normal_601b0cca65cd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486045/normal_600dda4159a8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379048/normal_600f44093e83e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368752/normal_600a0a71556d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450724/normal_601f561860cd4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463808/normal_5fcafad52be5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418987/normal_5fd26ccc4c634.pdfIn PDF document text
    • http://taxevidel.medianewsonline.com/lijamewefodirujegaton.pdfIn PDF document text
    • http://fakoxime.iblogger.org/mind_control_delete_wiki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495536/normal_5ff115fb1ebf2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407301/normal_5fef0c22d427f.pdfIn PDF document text
    • http://zijogeminevuxa.iblogger.org/antique_delta_band_saw_for_sale.pdfIn PDF document text
    • http://jamotovoxut.mywebcommunity.org/skyrim_load_order_xbox_one_2018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484804/normal_6034d494d2973.pdfIn PDF document text
    • https://cdn.sqhk.co/jeforije/cKR7gh3/dusux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368479/normal_601837cf97f24.pdfIn PDF document text
    • http://tupaxeguna.scienceontheweb.net/how_to_access_my_cloud_mirror.pdfIn PDF document text
    • http://bapefajavijofo.66ghz.com/73628206233.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vulemeke.rf.gd/free_seminar_evaluation_form_template.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_off0000e2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EA 4840 bytes
SHA-256: c0d09fa2a1bb9f399d1096d65b79f6f78e9409e56d48e74f817ead9c3c746bc9
font_01_sfnt_off0000f365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF365 10852 bytes
SHA-256: 346d8d1b3699c62243cdf2ad068af80d9a1486dd5d5f8cecb2114bc1bc52b426

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