Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9e8d51d677fddb5…

MALICIOUS

PDF

90.9 KB Created: 2021-06-10 00:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: dd657b58af9bd5d525ca855d1aea894d SHA-1: eeb2029f4cd82f7ba41a6f7e59ef1010b9a27cbd SHA-256: d9e8d51d677fddb56adb04d17c1207c2fc5e569ec73598ae632c6b4f221aa7c0
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 0.9997

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://leonvi.ru/123?utm_term=calibre+ebook+management+android PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/382d391f-1a61-406d-825e-81cef158c903/academic_phrasebank_enhanced_version_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdafc6fc-4b87-4544-885c-832db8d0fe94/what_are_the_5_psychological_perspectives.pdfIn PDF document text
    • http://lekuzax.pbworks.com/w/file/fetch/144421065/64699834428.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/w/file/fetch/144413253/how_to_take_video_with_flash_on_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a5ddd5b-02c6-4a22-8fab-85e542228c66/vitamix_blender_parts_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d4288f6-63ed-4933-ab2e-ac9cdedfbdb2/statistics_for_the_behavioral_sciences_9th_edition_solutions_manual.pdfIn PDF document text
    • http://minuwaxiper.pbworks.com/f/oxford_english_for_cambridge_primary_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54cf81aa-9277-4768-8027-7acbf9344aa2/46015828828.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c9df17b-3642-4fce-b097-cbf2182c8745/rimutekaviwobopisulaxaj.pdfIn PDF document text
    • http://topolopugad.pbworks.com/f/vowid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d49b0ab-41d5-491e-bd3d-705f73e5f484/how_to_turn_on_minn_kota_ulterra_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caa59c71-e98b-4be2-bd8a-394a76f7726b/40772598370.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16745803-e92f-41ed-9fd8-27f346e80922/descargar_gratis_el_libro_el_esclavo_en_completo.pdfIn PDF document text
    • http://mujefapufefi.pbworks.com/f/43187789432.pdfIn PDF document text
    • http://nunaruribeg.pbworks.com/f/vilisumoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d19eea3-100c-46dc-a291-8830ecb0985f/85576335868.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0edefb2b-d20a-4316-bee1-8a75c175af03/saeco_talea_giro_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c992e70f-1533-4736-8e5f-91a2c3f83d06/what_is_the_best_cordless_drill_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69b8235e-e4c5-4519-b419-ab2720928fc7/pojetusefawevasofaxo.pdfIn PDF document text
    • http://menovokosi.pbworks.com/f/tobevonevemi.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_off00010e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E18 5076 bytes
SHA-256: aef1a22701965aa81260c68e28057fde1b8bfafafbb57fbc59cff7d56643c69a
font_01_sfnt_off00011f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3F 12004 bytes
SHA-256: 203f328131a75e352d659fd0fafe07fafa7a51b93570a72f9d281897cd3b0745
font_02_sfnt_off00014829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14829 16264 bytes
SHA-256: 7b0c40c90ae81b7f04220f416a5eda77ddd14d353cb33f61dd2e57fcd88c0f27