Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a237cff47d42d2…

MALICIOUS

PDF

82.9 KB Created: 2021-04-01 19:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: cc4d43737d66844906eb2b6ce3c0d2b0 SHA-1: e7ace29e6a8207ff19f015f0fcbd135a3b6d856d SHA-256: a9a237cff47d42d2114b5fadf8bfcf0e13842800a76207241f85c9ed98324ec4
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 0.9994

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://vilenefex.ru/award?keyword=pedro+pescador+de+homens+hernandes+dias+lopes+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418791/normal_605d7984708a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479462/normal_5ffb6679e71e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485308/normal_5fc713c22bfe9.pdfIn PDF document text
    • http://xulodol.mygamesonline.org/37744787862.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380523/normal_5fc7745a8b6a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470685/normal_6040232c7059e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489593/normal_60051d53c1aff.pdfIn PDF document text
    • http://jugatilewe.22web.org/rigalimudajoreganixuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469633/normal_600ae95a433cf.pdfIn PDF document text
    • http://mujabelor.mywebcommunity.org/free_download_general_english_aptitude_questions_with_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wipemovawizofi.epizy.com/market_basket_analysis_in_r.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0159a97f-338c-4a7e-8ac4-e8a5d5058e72/how_did_shakespeare_impact_the_world.pdfIn PDF document text
    • http://duxegejuw.atwebpages.com/parumeriwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e09d705-5597-45a9-a5e2-eb0c5222c668/how_to_connect_atem_television_studio_to_computer.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/astm_a105_standard_specification.pdfIn PDF document text
    • http://sexomiluvimuke.rf.gd/school_uniforms_stores_in_jamaica.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/timifosuvan.pdfIn PDF document text
    • http://gurevetafajes.epizy.com/javascript_referenceerror_file_is_not_defined.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3de8b9f2-a500-4815-9bdf-6836e2682e6a/machete_season_chapter_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/pentax_k3_mark_iii.pdfIn PDF document text
    • http://zesugipove.onlinewebshop.net/vukeliz.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/what_are_heavens_armies.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/itunes_run_on_android.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_off000100ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CA 5396 bytes
SHA-256: 47f8355095dfd1c421d1c9aa6abaf7d5243b4bc3af9d6dfc24b8bf5d2f175f96
font_01_sfnt_off000112f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F9 13368 bytes
SHA-256: f694f68235f4607e39afe558dc738aa8a5b7d1234b2337ede75c8146c1f69d7b

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