Malicious PDF — malware analysis report

Static analysis result for SHA-256 f73e0bcd6ba81df2…

MALICIOUS

PDF

78.3 KB Created: 2021-05-12 04:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 465df32a8264fcb743aa84b2bad3e9d3 SHA-1: 8070891d7b5ad923acaecd45371d6bef2270d686 SHA-256: f73e0bcd6ba81df216223f1d1969854b5ab42aa67465517af41cb69968b79006
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, but no clear textual lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/strik?utm_term=will+a+masonry+bit+drill+into+concrete PDF link annotation
    • http://vegofejolafud.mygamesonline.org/65516249922.pdfIn PDF document text
    • https://jatuvukaxakepu.weebly.com/uploads/1/3/4/3/134313635/xituvorabiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380226/normal_5fdc56a340107.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409623/normal_604a7425383ec.pdfIn PDF document text
    • http://pupezawat.scienceontheweb.net/precursores_del_liberalismo_economico.pdfIn PDF document text
    • http://vetovikaxu.mypressonline.com/24221180474.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463002/normal_605441fa1f3fb.pdfIn PDF document text
    • http://ruvujagefeko.mygamesonline.org/1984_chapter_1_and_2_questions_and_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369793/normal_6034c729d3b1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365582/normal_601b924d41b20.pdfIn PDF document text
    • https://pusosisuko.weebly.com/uploads/1/3/6/0/136094517/07c246c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375531/normal_5fd2eb386a33a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://37e79482-e567-4eff-b449-6ea9b90d4679.filesusr.com/ugd/cff0cd_3b23100b05954493982a70d8fad9cb52.pdf?index=trueIn PDF document text
    • https://788ae96d-7a4f-4726-91a9-07bb742fb3e7.filesusr.com/ugd/97aff7_907ef267c3c64e1480be26ef605a124d.pdf?index=trueIn PDF document text
    • http://gutekuretejapoj.onlinewebshop.net/86382857237.pdfIn PDF document text
    • https://48936d5e-4b15-4059-a328-ddb12afcc15e.filesusr.com/ugd/173145_fb9b5bd334694aac8afb4b28dd48b68e.pdf?index=trueIn PDF document text
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_b65bda0d98fe4d518f78d5da5dac429e.pdf?index=trueIn PDF document text
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_1651f2b7b527424a957a95428c1545a0.pdf?index=trueIn PDF document text
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_40bc46b46d3f452e96ef8d49dacb39e1.pdf?index=trueIn PDF document text
    • https://b2fc43c4-60ab-4dc1-a1c8-84833fda4e2a.filesusr.com/ugd/37321e_c19be3dbd4df49b395053740c7437b8b.pdf?index=trueIn PDF document text
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_744ab6dc6e29498abab9b966d4fa69d9.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_off0000f44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44A 5340 bytes
SHA-256: e7c73675c617d7535562d17dc9e9b025830f6c36e4f6d84f6b9c7fc0d84cf3f9
font_01_sfnt_off0001066c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066C 10432 bytes
SHA-256: 3db3f4ce0fa228d3da691927ff9242717676f20e709906738dc7f5e58ab5ddd1