Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5e8c01c57e69c5…

MALICIOUS

PDF

72.1 KB Created: 2021-04-16 19:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 473d2fd2b0a58b9ae121ab3f0adb5bc0 SHA-1: ff86e7225a6e0b1f972dbd963744f8a06bd94c50 SHA-256: 5b5e8c01c57e69c5821098bf14a08f2b8d6ba22e77161d07c42fe751daa74838
156 Risk Score

Malware Insights

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

The PDF document contains a heuristic firing for PDF_SEO_LINK_FARM, indicating a large number of embedded external links. One of these links, 'https://druttle.ru/strik?utm_term=what+is+god+like+in+christianity+ks2', is flagged as an external URI. The ML classifier and ClamAV also strongly indicate maliciousness, consistent with a phishing or malicious redirection attempt. No scripts were extracted, but the overall structure suggests an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://druttle.ru/strik?utm_term=what+is+god+like+in+christianity+ks2 PDF link annotation
    • https://porukugo.weebly.com/uploads/1/3/1/3/131380087/jezadevosaxe-wivufapiwogupaj-tozow-kexudibiragedi.pdfIn PDF document text
    • https://jinafoxibufesow.weebly.com/uploads/1/3/5/2/135293268/8784668.pdfIn PDF document text
    • https://pisaloxonuk.weebly.com/uploads/1/3/4/3/134391291/715913.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b70c574-f7b2-4754-9725-bf3a562c88af/xutiligilojifum.pdfIn PDF document text
    • https://e5aadbcf-511f-4ee2-989a-4410a22eeed0.filesusr.com/ugd/64930c_b91f091e63304ce3ac5dc1f884bf02ee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vajefam/softonic_google_chrome_latest_version.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/cameraman_gangatho_rambabu_videos.pdfIn PDF document text
    • https://40ba1f7a-6e91-49bb-bbb8-dfbb40a2bc60.filesusr.com/ugd/22bf55_64b95a1378614070a29639676710f2d7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/somamere/exponential_line_of_best_fit_desmos.pdfIn PDF document text
    • https://8dfdba76-182f-4dc4-9dda-37a8c8d09dc9.filesusr.com/ugd/4ae4db_f36f8957ff6a4e979d69c7e9f7644c3c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sesijesule/nordictrack_commercial_1750_treadmill_best_buy.pdfIn PDF document text
    • https://96ea5dd8-6962-4d57-b29c-fb233a715e3b.filesusr.com/ugd/ac3463_1a7a6e67beaf46dfb9235291eda5f784.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b82eff69-3ffe-4426-ab5e-82d74ff7139b/remington_700_vtr_stock_upgrades.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/streetcar_named_desire_sparknotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d01dc158-8091-43be-9334-e1807e990bdb/32844768527.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/ticket_booking_website_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/s_p_d_f_ka_full_form.pdfIn PDF document text
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_615289605302439c8f9d516bfcfd06a8.pdf?index=trueIn PDF document text
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_d1d11af0d6fd43d09049eb2ffb6c4d0c.pdf?index=trueIn 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_off0000dd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0B 5512 bytes
SHA-256: 9fa8a8eeed165b97653e38358f6ebbe06e876fdaeb580feca91ddec64552b9f4
font_01_sfnt_off0000efd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD8 10180 bytes
SHA-256: 5ef94271186b0371f3f926b6c5a967ce9378c3dc90e269faa0f41949f1665937