Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b3556aaa954ba99…

MALICIOUS

PDF

82.1 KB Created: 2021-04-02 15:19:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a70433390b362f8f2c02c3c3a5e6765d SHA-1: 59e3a45be3ff954fa70bfed97031c504e55daa28 SHA-256: 4b3556aaa954ba99813971a4a7c118026ef66d65624b37f87e2370d7cd7469e9
186 Risk Score

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 0.9990

Heuristics 6

  • 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.
  • 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://kuzutuzo.ru/wix?keyword=how+much+is+revived+youth+cream PDF link annotation
    • https://doxediseweroz.weebly.com/uploads/1/3/4/6/134634010/2857529.pdfIn PDF document text
    • https://cdn.sqhk.co/mofipife/iiahbgh/mx_player_apk_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421776/normal_603c554eecb85.pdfIn PDF document text
    • https://bejelopaze.weebly.com/uploads/1/3/2/6/132682113/0fb67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501962/normal_60394dcf4a062.pdfIn PDF document text
    • https://vavimogazoru.weebly.com/uploads/1/3/5/9/135968849/zodapi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450139/normal_60447036860d3.pdfIn PDF document text
    • https://nugekiva.weebly.com/uploads/1/3/5/3/135322430/d668e5d02f021.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzowadijavu/oifQfie/international_business_consultant_salary_canada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483071/normal_60354107227f4.pdfIn PDF document text
    • https://cdn.sqhk.co/pelopuxi/rgiqijf/scruff_a_luv_snow_pals_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/nawamuzimosu/heyUhaT/chakravyuha_yenaithu_song_free.pdfIn PDF document text
    • https://cdn.sqhk.co/jakatote/gdv6zif/aesthetic_wallpapers_black_lives_matter.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454545/normal_600fe90b0f261.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/5695d797-668b-425c-9ee9-9c224272b96e/kawasaki_engine_oil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfced63e-80d3-4036-9cf3-7d0f89ba7add/tree_of_life_pendant_silver_and_gold.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/724a39dd-f635-4506-a122-cfb083400811/nulilivumuvizubikewijud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b1654d4-efe8-4ee6-8864-4aefdf96fb9a/86256527464.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bc3b046-bbba-40fa-aba8-94e4b5fbe847/organic_chemistry-janice_gorzynski_smith_3rd_ed.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/infographics_free_ppt_templates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b9614bb-ee3f-41c5-bbb6-191ccb175596/xunifinu.pdfIn PDF document text
    • https://s3.amazonaws.com/gonasidupij/diwaxubiwujanorefi.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/79932237904.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97c2ab73-71ce-4c7e-8315-d771b9cd9f46/3872916578.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/reformas_de_cozinhas_pequenas_e_baratas.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF672 5140 bytes
SHA-256: 02ee728cb2b18cd2135abe0f791f3f8d7600f1a93427540af644a64a778d69a8
font_01_sfnt_off00010803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10803 10588 bytes
SHA-256: b6b4dbe4a700e0b5fb743a964331c16b8c905cc9a017fd7a5a927306ff2b376b
font_02_sfnt_off00012c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C28 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e