Malicious PDF — malware analysis report

Static analysis result for SHA-256 29876b2ae90ae607…

MALICIOUS

PDF

74.5 KB Created: 2021-04-02 07:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: fd2b71e50165a139dc3ca7be6888ba8e SHA-1: 5196a6912cc388b6da4e3daeed670871ff7349db SHA-256: 29876b2ae90ae607a6c9d94d8213f9d52c3f2ec22246890e24b227e223c8e343
186 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 6

  • 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 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.
  • 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://soxebez.ru/strik?utm_term=how+to+get+a+royal+caribbean+crown+and+anchor+number PDF link annotation
    • https://cdn.sqhk.co/kuretunaba/jfGy74m/download_subwoofer_bass_booster_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/jotenitix/iajbgee/jimepali.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/916b36b7-e177-4019-8473-d104581e4241/journey_to_the_west_characters.pdfIn PDF document text
    • https://fc91d542-d4ed-43bd-ae7c-74c09d85cdce.filesusr.com/ugd/3254bf_5ea379187f744c41bbc6b081bb53efdb.pdf?index=trueIn PDF document text
    • http://ruxuwidoke.epizy.com/steam_disk_write_error_paused.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c224ea3-b7ea-4569-a0fd-8820df4a5bac/how_to_harvest_lettuce_from_your_aerogarden.pdfIn PDF document text
    • http://pemukusa.epizy.com/marantz_7010_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94919dff-f82d-47ac-a1da-8409e8081a6e/how_to_work_out_how_many_atoms_in_a_formula.pdfIn PDF document text
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_c680a9c516c345d2ad1d92b6c867e88d.pdf?index=trueIn PDF document text
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_f720b81c168b42e9835f4ff6b809bb81.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca443db8-0d27-4b5c-a8a2-6e7ee5dc81a6/96519000784.pdfIn PDF document text
    • http://kutubuge.rf.gd/japofelerazak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23a7649e-567b-4490-82d4-62b65f98a771/kigawimuxozafafan.pdfIn PDF document text
    • http://kovisijurafolor.epizy.com/75568769845.pdfIn PDF document text
    • http://vusukunuvedigup.epizy.com/83901628376.pdfIn PDF document text
    • https://fb413987-6e77-4bf1-aaa6-e97eb550fbee.filesusr.com/ugd/108936_f409675d01ce4ad0a16e2833822c4610.pdf?index=trueIn PDF document text
    • https://e60c805d-b9e1-47fc-b045-983511e9ac1f.filesusr.com/ugd/116bb2_287cdd39b9dd4341bf3137a27e8d4b25.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_off0000e376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE376 5468 bytes
SHA-256: ad7d030b2ed9238aa87cf0726e9dd7ff5ba37e1bd11bd60d59f9fecade7a2bb5
font_01_sfnt_off0000f5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FD 11328 bytes
SHA-256: 180ebaa045fc49c43b390d71409794a33c690ef0e29bdc8c8b6df0fddd3d2597

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