Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b7316ba757f00b…

MALICIOUS

PDF

87.2 KB Created: 2021-03-13 16:40:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a4944135f59024fb2f87d9bc6aa9a3c4 SHA-1: 98a88efa44a842c17d12ff3da1601ae7ba6d50f4 SHA-256: 54b7316ba757f00b4cefd57a8a9796f7c970c7f08f6d2eee12753069f20c788d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://lozipotod.ru/strik?utm_term=oracle+database+fundamentals+ppt PDF link annotation
    • https://cdn.sqhk.co/wemorapi/LCBpQig/nemaforuwaxu.pdfIn PDF document text
    • https://cdn.sqhk.co/risafapiven/ififvhc/karozajexatini.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/jjiVhep/5532861894.pdfIn PDF document text
    • https://cdn.sqhk.co/leruwexikud/BMwgiLT/the_wolf_among_us_2_download_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3dd85f33-233b-4b3c-8e53-142bc8307eec.filesusr.com/ugd/8df890_933c2e8fff0a4d24b693d8f69a80b9c0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wuniku/astro_kid_2019_subtitle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8cc0b0a-d974-4900-90ba-76963016d333/bhagavad_gita_chapter_2_in_tamil_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0ffc47d-871b-42af-af11-78ca36027ccf/how_to_tell_bible_stories_to_adults.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d34f23e4-54a5-45f8-9109-4645059af722/why_is_my_whirlpool_cabrio_dryer_not_getting_hot.pdfIn PDF document text
    • https://6cb1c90e-07cf-4522-b85d-4edd8abc33c8.filesusr.com/ugd/0c41e7_78ea8973d9ca4ef0b60fc2835e9c0832.pdf?index=trueIn PDF document text
    • https://1a2149e7-ca7f-4e7c-a584-0e483de6f3af.filesusr.com/ugd/9219f8_0fc9a02515ec4d458f486ae6847adb83.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jusuberu/google_sheets_match_case_sensitive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77e498bc-fd72-43b5-9984-ba7bd996dae0/audiolibro_el_principito_en_ingles.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/import_excel_sheet_data_into_matlab.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/teeter_hang_ups_ep_550_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/llb_admission_form_2019_lucknow_university.pdfIn PDF document text
    • https://0ea28b16-58c2-472d-b6be-3e97fe9b7bb6.filesusr.com/ugd/696b8a_9c1eabf3faf5469aa3a677be8957d3af.pdf?index=trueIn PDF document text
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_cdd59bb19302433389c6e8059cab4ffb.pdf?index=trueIn 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_off00010f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F24 5468 bytes
SHA-256: 2ae0bbd9de71438da9c9f77aafb54b5a89e579c115cadd352d938ab87dfdbf51
font_01_sfnt_off0001219a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219A 13740 bytes
SHA-256: 5bedca5e651356a73cb15a03c1e7bb8967c12512d0163a4c48bd268f50fb0054

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