Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ed53840ee97b137…

MALICIOUS

PDF

120.1 KB Created: 2021-03-16 21:15:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 77af0bde8318066cbae16b6a3ffc2ae6 SHA-1: 500a3efbe6797ef30b9e0eeab4335695238844e4 SHA-256: 4ed53840ee97b1377d8f4c40f94ca0ea11499bd19f8ab860b838541af722a6b9
244 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable domains and redirectors, designed to lead users to malicious sites. Heuristics indicate it's a link farm and a potential phishing or malware distribution vector. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://yafferge.ru/award?keyword=educational+psychology+meaning+pdf In PDF document text
    • http://ketadiets.site/big_little_lies_season_2_review_imdb6qk67.pdfIn PDF document text
    • http://top-odejda.com/bikavisj3rae.pdfIn PDF document text
    • http://verifybadgehelp.com/fish_in_a_tree_chapter_1yr0ov.pdfIn PDF document text
    • http://mazafaka69pussy.online/sevol5chm7.pdfIn PDF document text
    • http://shoop-fk.ru/nusinikudmshh6.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/3b64c133-005d-4751-9982-088d8c2311d3/lupekixizewagem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/673787e7-ad42-42d3-8f2f-1818cd83e7a7/self-assurance_meaning_psychology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7414887-e3c5-4521-a130-d68533dd7a9f/opm_federal_holidays_2021_inauguration.pdfIn PDF document text
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_1e7b88038b0848dcb397b83b01f63559.pdf?index=trueIn PDF document text
    • https://070488ba-e3d9-4c74-834b-445551f5513c.filesusr.com/ugd/fb83f1_0ac96d14c8d3434088d722d9a1bcef0d.pdf?index=trueIn PDF document text
    • https://1347de4c-4e54-429a-b84c-372e60bc5a2b.filesusr.com/ugd/6c98bc_19f05cc4cc8a45d2ae89e3d6bf6d43f0.pdf?index=trueIn PDF document text
    • https://a2214900-82f6-4ed5-a432-d5ffd14110fa.filesusr.com/ugd/306b6b_3003a6ecdd684018988de82807b8dae9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/331cbca8-d846-44fc-becd-79f99afe7c4c/a_time_to_kill_book_sparknotes.pdfIn PDF document text
    • https://0e627107-309b-4451-a84d-e7064c41fccd.filesusr.com/ugd/04c368_01175668b72e4e6fb05aac7a64dc8f59.pdf?index=trueIn PDF document text
    • https://36071b1a-d853-4ad1-bccf-0ed894d94038.filesusr.com/ugd/906e9f_4302dde040d943399a3cceb191eff8c3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/latitude_e7470_bios.pdfIn PDF document text
    • https://3b0fe5ff-7f86-489c-8138-fc984e51136c.filesusr.com/ugd/bfd78a_74c15106025a44f7b8b8a787e83df97d.pdf?index=trueIn PDF document text
    • https://cd753cf5-d90a-4073-9c55-931a76e81761.filesusr.com/ugd/8826df_3a7c7baa1460479da2bfab368de8ba4b.pdf?index=trueIn PDF document text
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_c645a9b215ee48c2afc3f269241584ed.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/11dc342b-0a08-4d7a-bb0e-62837de8839e/the_secrets_of_underground_medicine_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/whatsapp_status_video_tamil_free.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_off00019734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19734 5532 bytes
SHA-256: aa37e46b00a1ff064372d04c6ac6a7e4974331197c117da33691fbb771922f50
font_01_sfnt_off0001a9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9F0 12380 bytes
SHA-256: 483a0b25dd40974b05b6852b162b1ca4bc06e381401b52db00541292ff42cd82