Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f9d0225c2c86acc…

MALICIOUS

PDF

74.5 KB Created: 2021-04-03 13:39:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 83a001807f3ea94c184cea191d44e659 SHA-1: 1d2c0d1aa16504fe66eccea7122d80424c422b99 SHA-256: 7f9d0225c2c86acc7f47b1b1dd5f5542e070132bffbc070c8e548de222e15e8e
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://dugedepap.ru/wix?keyword=stage+right+productions PDF link annotation
    • http://rekusigixebisuk.22web.org/dosisofizigobi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426945/normal_605600a238ae1.pdfIn PDF document text
    • http://notudokebifapaf.22web.org/deformation_gradient_tensor_example.pdfIn PDF document text
    • https://zimemomikinipex.weebly.com/uploads/1/3/5/3/135347479/venudezixefele.pdfIn PDF document text
    • https://vewiwuxipax.weebly.com/uploads/1/3/2/6/132681682/jixipaxu.pdfIn PDF document text
    • http://vugewanir.22web.org/78716588567.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486743/normal_6019d07899207.pdfIn PDF document text
    • http://joxoxediva.22web.org/how_sand_blasting_machine_works.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/punurum/is_the_fifth_wave_a_good_book.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/zambia_country_report.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/fox_company_received_the_following_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/vukujidor/66231117665.pdfIn PDF document text
    • http://mizigapixif.rf.gd/58072142177.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/netacad_cisco_chapter_7_exam_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/what_are_several_uses_for_transition_metals.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/59654972892.pdfIn PDF document text
    • http://mijumepalus.rf.gd/elements_of_a_story_worksheet_grade_3.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/murugan_songs_tones.pdfIn PDF document text
    • http://jovawat.epizy.com/xelateja.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_off0000e6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F6 5408 bytes
SHA-256: c0147c3fe51ceee46cacff539e4879bc622908ff35a62732bcc327c55e661655
font_01_sfnt_off0000f94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94E 10460 bytes
SHA-256: 92bd6c7dd408073af6e6a8ce9df72e60885258bc00b8aa8846c609ff1bcc207d

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