Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2de3e244581e064…

MALICIOUS

PDF

137.5 KB Created: 2021-03-28 05:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f70ecffca7aee7587808d91a153a57d2 SHA-1: b4df71f78ae334fbcd9f00a50c959093151d7be6 SHA-256: a2de3e244581e064742929ab3064d0f9ef07e98a16b8b72f88be5e56bcd0efb9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous external URIs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users to malicious content or phishing pages. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xajibur.ru/strik?utm_term=what+does+brown+vs+board+of+education+mean PDF link annotation
    • http://hookup756.fun/nevoxikojunakc4nhv.pdfIn PDF document text
    • http://vejuguxoxa.iblogger.org/carnival_row_episode_1_parents_guide.pdfIn PDF document text
    • http://salestore.pro/161752731066wj0t.pdfIn PDF document text
    • http://nikecortez.net/kunimulejikotusidofopa0ml15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408176/normal_5fe8d549ea4c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462352/normal_5fc95dcd26ccd.pdfIn PDF document text
    • http://telgrm.site/vomoxoxxrxt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379231/normal_5fcf5a3862875.pdfIn PDF document text
    • http://alexandreablog.com/god_i_look_to_you_bethel_chordsm4n38.pdfIn PDF document text
    • http://olx-delivery.cc/mixegapiganadak06j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384639/normal_60229effb590e.pdfIn PDF document text
    • http://webmastervlad.ru/witosaduzh7ylb.pdfIn PDF document text
    • http://spain50off.info/938831317044rjvd.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/tafogusegabomu/dunomaj.pdfIn PDF document text
    • http://vawujularow.rf.gd/44742657203.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c79a1b4-f85e-49a2-a18a-79086a042d7b/mechanical_engineer_salary_per_hour_in_usa.pdfIn PDF document text
    • http://tosefiwaniw.rf.gd/mathematical_tools_for_physics_class_11_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9626753e-e28e-40f6-a523-3705d9fc2b32/padel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/609a0b5f-5e50-4322-aea4-4f3678ebfada/niwafikuvabutixiga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f35e3db6-8c54-49dd-8718-3dab299b7d4c/jotowegifiwotapukagepi.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/xoraxuri.pdfIn PDF document text
    • http://nabunuwo.epizy.com/bittitan_sharepoint_migration_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/150f6af6-4e7c-439f-bc6f-4b54c179c1f6/fexavagu.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/lafode.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_off0001dbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DBAE 5532 bytes
SHA-256: 80905e58aa7462c9940a31ddae629dfabaeca5db441e57f7d065f35fe2e4e0d4
font_01_sfnt_off0001ee75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EE75 11764 bytes
SHA-256: bd205a38f6e7fb98f8430a3b2db86693d31ce5e0e805e0d02d68cbaf7876bab5

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