Malicious PDF — malware analysis report

Static analysis result for SHA-256 168b7eba5b987262…

MALICIOUS

PDF

79.1 KB Created: 2021-04-20 00:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: baf8b689222e59921c424d7e41d5bb38 SHA-1: b73eb7f60572721a3390cf0567f6efcc780ecf2a SHA-256: 168b7eba5b987262bc48c99f6a54db544fff1896c7c58e272f06151943bf570b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9991

Heuristics 5

  • 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 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://lozipotod.ru/strik?utm_term=what+is+cultural+competence+examples PDF link annotation
    • http://kikovetademu.22web.org/doraemon_adventure_games_free_for_pc.pdfIn PDF document text
    • http://tegotapiw.scienceontheweb.net/difference_between_aerobic_and_anaerobic_fermentation.pdfIn PDF document text
    • http://rurojewof.22web.org/31548934380.pdfIn PDF document text
    • http://vuwimoxit.mygamesonline.org/money_manager_badge_requirements.pdfIn PDF document text
    • http://gosugas.getenjoyment.net/62617886833.pdfIn PDF document text
    • http://gelupulofevabek.medianewsonline.com/data_analysis_plan_research_proposal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494673/normal_602d6d0831d8b.pdfIn PDF document text
    • http://wejuveziwep.mypressonline.com/the_collapse_of_complex_societies_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473622/normal_5ffbc150623df.pdfIn PDF document text
    • http://nabavawuzafurur.mygamesonline.org/gudubalimuzubuxoje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500417/normal_600dd8847ed2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385635/normal_604dd7e132ae9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366668/normal_6021d2f3b8bd2.pdfIn PDF document text
    • http://nejevefivi.mypressonline.com/24362094922.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/gowupuzokowuxes/gakanuzowilavusagirod.pdfIn PDF document text
    • http://liroporuki.myartsonline.com/online_banking_services.pdfIn PDF document text
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_c771e38b78954bca85deca6efd5038cc.pdf?index=trueIn PDF document text
    • https://438c9214-13ba-44a2-8469-a4c97ff43377.filesusr.com/ugd/5d46a0_af64df268a4947ff9d39818809d5d6b4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fopalew/cloudformation_template_conditions.pdfIn PDF document text
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_ae724b1f4a5944868a9c92781ad728dd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/zatemijirazebibuti.pdfIn PDF document text
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_b62c3afd75be40d7b7aa0867bbd4df16.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/remuv/posikadi.pdfIn PDF document text
    • https://d6bf9bfb-c092-4b17-ab9f-91da83e6a9d2.filesusr.com/ugd/d7ad14_ae9bc7c66dcf4ff7ae055868642cd394.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_off0000f85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85A 5252 bytes
SHA-256: df5c8afa440a5094ce45775dc9ff39feb3fe70870a7b601bb72a614bfff955a9
font_01_sfnt_off00010a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1B 10628 bytes
SHA-256: 83fac7962bfb38d3f3a0b0df4224125657e895c57432809857ca45f3d6ffffbe