Malicious PDF — malware analysis report

Static analysis result for SHA-256 407e45aacfcb5620…

MALICIOUS

PDF

84.2 KB Created: 2021-03-15 04:18:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: abcef87ecc4e4d751d10225f6b2be850 SHA-1: d9a49fac1e50c80baf57a23fe4f498da6dea3077 SHA-256: 407e45aacfcb5620c95ebfeb8d859d072be7883b9717a126f4b02ab6030dad41
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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 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://zajinet.ru/strik?utm_term=subject+verb+agreement+worksheet+for+class+10 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453327/normal_603058089775b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425217/normal_60185fa8d2c3c.pdfIn PDF document text
    • http://xemakaze.mywebcommunity.org/payroll_management_system_literature_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379359/normal_604ccaf64c557.pdfIn PDF document text
    • http://lokubakodo.getenjoyment.net/mini_weapons_of_mass_destruction_book.pdfIn PDF document text
    • http://pirawamajakemiv.22web.org/story_of_o_online.pdfIn PDF document text
    • http://sigipotewal.22web.org/tinofeni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457320/normal_6026c6ea92ef7.pdfIn PDF document text
    • http://faripofijukevom.mywebcommunity.org/bubad.pdfIn PDF document text
    • http://zixaxagewan.mypressonline.com/socialismo_utopico_frances.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wigezenefibi.epizy.com/wow_professions_leveling_guide_enchanting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9069d40b-4158-4a16-a196-02ea44221177/best_traditional_african_music_albums.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44e07817-3ccd-443c-8a62-016a12657ea1/39906070050.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0424190b-d9a3-45c2-85d5-954a23b43d1b/prayers_that_rout_demons_by_john_eckhardt_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17c6efd8-52ba-4de3-93a0-7967fd2bc839/57360496370.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a6f2b95-4184-4933-a461-a3a7960e3150/duxalorigofanu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea6b0c29-3346-47bf-b892-8a7d67468b7d/el_principito_pelicula_online_1974.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74649272-2b4c-4922-a850-f58d69fa9115/tinejamujapavuwojab.pdfIn PDF document text
    • http://tukudapig.epizy.com/chaahat_1996_full_movie_3gp.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF357 6024 bytes
SHA-256: 1a770593b2d8fdc4a2f0e33a68db0294b1421c645ecfd9f8c8d80d50a906c5af
font_01_sfnt_off000107d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D5 11020 bytes
SHA-256: 385e785f5f9079a5d73a026c3f32b1e2f0732659aa049c5b41440d8e543b2308
font_02_sfnt_off00012d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D45 16348 bytes
SHA-256: 2334ade245ec46eaa3943be3e15553e8ac07f98e23f092e9c17c46eab61462e4

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