Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5cc463aa65b6662…

MALICIOUS

PDF

99.8 KB Created: 2021-03-14 20:27:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0be28982fe0405917f529d822e747f45 SHA-1: 592240c8debc4b1d3d5073e9c27c9fc88c994399 SHA-256: c5cc463aa65b666278aca59581e24cae777c4a9837d4e6d90cc3b7142f982e68
156 Risk Score

Malware Insights

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

This PDF document is classified as malicious and contains a large number of external links, many of which are likely part of a link farm designed to direct users to malicious sites. The primary URL identified, https://xezojetit.ru/strik, is suspicious and likely leads to a phishing or malware distribution page. The document's content, presented as educational material, is a lure to encourage clicks on these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/strik?utm_term=modelo+de+inventario+de+periodo+%25C3%25BAnico+ejercicios+resueltos
    • https://cdn.sqhk.co/pajokiman/hiiUjaK/wuwowelu.pdf
    • https://cdn.sqhk.co/nixafusoda/eNf6tid/mothers_love_story_in_the_bible.pdf
    • https://cdn.sqhk.co/vinogusi/hf5MMmX/23379318580.pdf
    • https://cdn.sqhk.co/gizafimode/KjjgcL1/tratamiento_absceso_hepatico_amebiano.pdf
    • https://cdn.sqhk.co/sujutowupolu/jaic5Nm/73171713466.pdf
    • https://cdn-cms.f-static.net/uploads/4391317/normal_60218947af324.pdf
    • https://cdn.sqhk.co/pimidima/lgTmJhh/zevemenujodizepumedital.pdf
    • https://static.s123-cdn-static.com/uploads/4390323/normal_5fc75b723139f.pdf
    • https://cdn.sqhk.co/ditetona/geRgclR/71806276406.pdf
    • https://static.s123-cdn-static.com/uploads/4529893/normal_5ff231bc5254e.pdf
    • https://cdn-cms.f-static.net/uploads/4476416/normal_601cbee6c9a12.pdf
    • https://cdn.sqhk.co/wubunepan/a31GZj6/square_adventure_geometry_dash.pdf
    • https://cdn.sqhk.co/tibakekavero/0jchiLw/26149353888.pdf
    • https://cdn-cms.f-static.net/uploads/4374185/normal_604597f69d425.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/21d70057-9ee6-4b71-917e-142c9d8c427e/bidigofinapovavedopilix.pdf
    • https://f62823ea-e863-4eb7-bd7c-e3bac0139ff1.filesusr.com/ugd/8c639a_04c6b254eebc4579b82e304c6f032e50.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5da9064f-644a-4041-b6ab-c400b68e0519/what_is_rhythm_in_web_design.pdf
    • https://ba3a7bb5-edd2-4228-b29c-cf272df6a868.filesusr.com/ugd/bd1c09_94500bb1d5784520a6678e53bf6d886f.pdf?index=true
    • https://4f640d82-8365-4c22-93d6-dbd3427c3fb0.filesusr.com/ugd/55e8b7_6d512754b80c411da4ee0245f7b92710.pdf?index=true
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_1396a6f8021140f3ae5254723b433d90.pdf?index=true
    • https://b4095e1f-5e43-4c35-8b28-ff0c3185c247.filesusr.com/ugd/9cc3de_2e35e9fe61d04a61be2c5adb2257df50.pdf?index=true
    • https://uploads.strikinglycdn.com/files/73e2624f-c65e-431e-800b-71f90bda4d98/31227871293.pdf
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_8f615f19beb84005ac7db28bc5ddc2ad.pdf?index=true
    • https://4a39c6c9-989b-4d11-b2d8-cc0becc7f193.filesusr.com/ugd/ef0078_2943c9c618c94df792758f802df72f87.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000142d5.bin
37acae7e353425e0feb5815c9809c54df48c381b1d56ffe49df5b475aa062f61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142D5 5324 bytes
font_01_sfnt_off000154e4.bin
037aa3cade045768fe8b60d1e1389593a4ae9e2271636683d8b84bb48b3cd77d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x154E4 12928 bytes

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