Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7422a47aad9d588…

MALICIOUS

PDF

78.4 KB Created: 2021-04-01 18:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6487f130d341fe6edb5d5d44a25cfcf7 SHA-1: ae56a710ed2f0d7908972ed5f37ef330e55edec7 SHA-256: f7422a47aad9d588833b60a34a77b2d6df663773576d530b84b7d3b7bb99f556
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 0.9961

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://druttle.ru/strik?utm_term=english+report+writing+examples+for+students PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477163/normal_60335bdf7a42c.pdfIn PDF document text
    • http://yourlivehelp.com/strategic_market_management_aaker_ebcgxox.pdfIn PDF document text
    • http://4kuhd.me/sim_tool_manager_uptodownt1lqs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447280/normal_6000475dcad79.pdfIn PDF document text
    • https://risegexof.weebly.com/uploads/1/3/4/6/134661868/6af089b9b538db.pdfIn PDF document text
    • http://golosa-spasibo.ru/saeco_coffee_machine_repair_torontozoaev.pdfIn PDF document text
    • https://cdn.sqhk.co/bekutojeke/xZhcijR/55122419910.pdfIn PDF document text
    • https://cdn.sqhk.co/nadetajagupe/Iiehfje/68892073929.pdfIn PDF document text
    • http://lestyprin.online/compare_apples_and_oranges_idiom_definition5s5vv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454051/normal_5feeba195f547.pdfIn PDF document text
    • http://forpost-electrica.ru/distance_formula_word_problems_worksheet_doc23jpd.pdfIn PDF document text
    • https://tivepikilusu.weebly.com/uploads/1/3/4/7/134759048/8626803.pdfIn PDF document text
    • https://bibatajikoxego.weebly.com/uploads/1/3/5/3/135315017/lozigedaxapejutapat.pdfIn PDF document text
    • http://bostpolamos.site/gefusaxafazamirajodimemuvh7voe.pdfIn PDF document text
    • http://xtreme-sport.ru/business_plan_for_bakery_cafe552yx.pdfIn PDF document text
    • https://morozosewiveloz.weebly.com/uploads/1/3/4/3/134387595/gogum.pdfIn PDF document text
    • http://dressnbuy.com/60066701680i6i1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422877/normal_601537d702e14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422640/normal_600770d0c371d.pdfIn PDF document text
    • https://cdn.sqhk.co/zifuvifiweva/ha0SBgg/netflix_christmas_movies_2019_kurt_russell.pdfIn PDF document text
    • https://cdn.sqhk.co/givujelised/fkOQWih/piwokazowutatub.pdfIn PDF document text
    • https://wuremuzagatixob.weebly.com/uploads/1/3/4/6/134612401/9723656.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://54d25d35-1219-4e5f-97c3-905e72ea606f.filesusr.com/ugd/6d59ab_520bdbbaf99b45a39b114c92d67eead6.pdf?index=trueIn PDF document text
    • https://e24ff460-1725-4b9d-a7de-f8438c38fea0.filesusr.com/ugd/366850_96ad0ccb427e4e68a933f27f8f714c36.pdf?index=trueIn PDF document text
    • https://7722bba5-72ad-4d15-a72d-9ce9fbdcf1b5.filesusr.com/ugd/772ad5_27ea66fd3bf444a198568c2bd5060ca7.pdf?index=trueIn PDF document text
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_9b6b8eb798004330ae2b985b6a08efd4.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_off0000f476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF476 5572 bytes
SHA-256: 51979c36ffa23d34df1b212946860bebf6c310cf0e0aee180e0e3c3d45c1817c
font_01_sfnt_off00010756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10756 10504 bytes
SHA-256: d891e44f67b04e81e8cab6d7ceb409a74ff4a530e6a135ec59fb3c917e59ffa8