Malicious PDF — malware analysis report

Static analysis result for SHA-256 f646fcc0047dbf9f…

MALICIOUS

PDF

72.6 KB Created: 2021-03-21 22:46:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9507ec819485d1d11e411b8d7bc46718 SHA-1: 9b8aa8bce563b6c54f0866ca8ca495c5bd8a4aeb SHA-256: f646fcc0047dbf9f200d2818d92f24d473331da28ef2009b816fa8afa30751e0
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 0.9996

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://nipisod.ru/123?utm_term=longman+preparation+course+toefl+paper+test+pdf PDF link annotation
    • https://cdn.sqhk.co/sadudolamom/idTjiha/15540498453.pdfIn PDF document text
    • https://cdn.sqhk.co/tokokoxisuf/h471SQl/notice_email_format_icse_2019.pdfIn PDF document text
    • http://magewedidi.iblogger.org/gexodewatijefinobika.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/1598c2df-a161-44da-ab3d-d01732d22b7e/eat_26_score.pdfIn PDF document text
    • http://nesenavepino.epizy.com/remove_watermark_xchange_editor.pdfIn PDF document text
    • http://tejusadesivuti.epizy.com/13289015472.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/44053794847.pdfIn PDF document text
    • http://mapedofagezil.rf.gd/heart_uk_cholesterol_diet_sheet.pdfIn PDF document text
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_e8609a7f00b946db8db12d006656db2b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc46a550-5314-4ced-988b-b1728dd28820/13748982907.pdfIn PDF document text
    • http://vorofij.epizy.com/motor-_cad_crack.pdfIn PDF document text
    • https://36425c1f-c329-48aa-845d-1f8252cb45c8.filesusr.com/ugd/01d500_e0d16a01fe414ba499e50dd2742f077c.pdf?index=trueIn PDF document text
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_da9c6841069747569b11bd95af278ad4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/210df5d4-8816-4886-9959-20fe29260cb9/ramijexesujejegofope.pdfIn PDF document text
    • http://jekowatu.epizy.com/how_to_disable_secure_boot_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1708d511-f2c2-4ebc-b538-8524a0ddb44e/navy_reserve_e7_advancement_quotas.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/furiously_happy_raccoon_face.pdfIn PDF document text
    • https://a84030a7-2e48-4039-807a-383e2b7216cc.filesusr.com/ugd/c5d40f_c20db2b18faf4b0e870503d13f02fba0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a3ec26f-7ac8-4f5c-87e3-8b546278ad3a/dipuxapudidedimibijaf.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/69520479899.pdfIn PDF document text
    • http://kapodos.rf.gd/m-audio_axiom_61_1st_gen.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_off0000d69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69A 5416 bytes
SHA-256: 7c1fe148dbe605e2716ebee386cc7b359dc03c90960d71970c3902692c55f1b7
font_01_sfnt_off0000e8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F0 13832 bytes
SHA-256: 1f72d87f8afd2e295811cc9f9a4390156e03047e9f7970765fde771b6879fd09

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