Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b40e5e699c47860…

MALICIOUS

PDF

98.0 KB Created: 2021-04-06 22:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: df5d84dc5a1e92bea4a2472b655ec15d SHA-1: b0ed74b08f8d062bdd44468ecf0be0be8fd9a668 SHA-256: 3b40e5e699c47860db719c887b31ab1d6cad665cc79d9958bc8965a500649429
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://baarspo.ru/strik?utm_term=mechanical+engineering+intern+jobs+in+milwaukee PDF link annotation
    • http://dashcamtopbest.com/8319315404851eve.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489422/normal_5ff47dbf79a37.pdfIn PDF document text
    • http://ezfix.asia/butexedebuluxanonutoruwexp1i1w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404528/normal_5fda2bf5ab930.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390095/normal_603ac54fb8106.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426280/normal_6036b16e34b74.pdfIn PDF document text
    • http://rentline.pro/the_vampire_diaries_season_8_episode_11_watch_online_freeu1l83.pdfIn PDF document text
    • http://agent-ritual495.online/stihl_460_lawn_mower_reviewstd9bx.pdfIn PDF document text
    • http://dostafood.xyz/nuwikigapexorusudixytjdi.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497093/normal_6020c1e951598.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407066/normal_5fc744fa30f74.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427514/normal_60057907d960a.pdfIn PDF document text
    • http://wonder-ita.space/29827009384k1cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369909/normal_5fcf714586cb7.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387033/normal_5fc5fa0f0d531.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_81db67bec29448a6b99d163e71bedf61.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d4cc542-d81b-4d38-a236-4997f54457f5/navopuselevawiso.pdfIn PDF document text
    • https://5e1ecd50-e572-447e-9dd1-c60ce64867c5.filesusr.com/ugd/9b2d9b_facd68f4f6f14718986f13e8233a5c14.pdf?index=trueIn PDF document text
    • https://37976aa0-f55f-47d3-847a-8d185b13ebf6.filesusr.com/ugd/1d6212_498a4d977eb7499d91574470548f1042.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4803199-4792-4f5b-83ce-2e24cdf4d7c8/what_is_the_interior_angle_sum_of_a_polygon_with_20_sides.pdfIn PDF document text
    • https://89f68ddc-9f98-4e60-8afa-3e0ca6603e9e.filesusr.com/ugd/4725f1_4534c6f32b494fc2a22686d035bff0d3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fae08ea3-f385-4625-984b-53589e08c90a/words_that_start_with_k_for_preschoolers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42da86c8-9b61-4ba1-9630-b37c2b1be481/star_trek_beyond_imdb_parents_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/508fef1a-f5ef-49a8-ac36-800221f768ab/80581304987.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_off00013ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FFC 5592 bytes
SHA-256: ace7c64e506c508eb3a014d208f1fb018ad13a5caf3598bf02865a3422f39fcb
font_01_sfnt_off000152f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152F1 11452 bytes
SHA-256: 58613e431f1827931af69a26fe393ee4c71746fbb6bdc3a8ee26f0f690bbc783