Malicious PDF — malware analysis report

Static analysis result for SHA-256 651e19e68e0b41a9…

MALICIOUS

PDF

92.0 KB Created: 2021-04-06 15:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 008e39315fd8c29bd704faef9e21c2a1 SHA-1: f101d1d344403538ee9a50b3616d7de2335d30dd SHA-256: 651e19e68e0b41a99d79be33bf80147442aa6899ef4533ee537d1fdda51baddb
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm, directing users to external URLs. One of these URLs, 'https://jottigo.ru/wb?keyword=una%20historia%20in%20english', is flagged as unknown and is likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/wb?keyword=una%20historia%20in%20english
    • https://cdn-cms.f-static.net/uploads/4459170/normal_602e0cdebe0cf.pdf
    • https://static.s123-cdn-static.com/uploads/4385412/normal_5fe50df4827dd.pdf
    • https://cdn-cms.f-static.net/uploads/4446762/normal_60206863ec08f.pdf
    • https://dopakuxapat.weebly.com/uploads/1/3/4/8/134895633/14e03c4.pdf
    • http://sdfsdfsdf.shaketorch.com/la_politica_linguistica_del_fascismo.pdf
    • https://luwujapi.weebly.com/uploads/1/3/4/7/134751522/ponijukalon.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_14fbe685d4e84c91a64ea986abbe4bcf.pdf?index=true
    • https://s3.amazonaws.com/pibajuwi/porekibagab.pdf
    • http://fokibuzevurir.rf.gd/the_synthesis_and_characterization_of_inorganic_compounds_jolly.pdf
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_a36b987f333f45bb8891c3fffd0dda67.pdf?index=true
    • https://uploads.strikinglycdn.com/files/514d0ddc-6fa3-4902-8ce2-c54d06363da7/45799462827.pdf
    • https://uploads.strikinglycdn.com/files/bdaa8dfa-364d-4766-9459-94f68c219006/19702735942.pdf
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_626c91e7823c4c2b9795889b48d75126.pdf?index=true
    • https://s3.amazonaws.com/vufupu/fexut.pdf
    • https://uploads.strikinglycdn.com/files/a5521485-861d-4f0c-9ea2-7428980ae343/jogedugojugobumor.pdf
    • https://uploads.strikinglycdn.com/files/fb38831f-88ce-44e8-b394-f539e955b6a0/72979777119.pdf
    • https://uploads.strikinglycdn.com/files/7f870b80-e9ab-4961-aa2c-a0dadb53cd61/88773790166.pdf
    • https://ef4b221f-cfb4-47e8-bf1d-3b5092770df7.filesusr.com/ugd/4948da_135c91152cf2426085ef28cd5e954c2c.pdf?index=true
    • https://s3.amazonaws.com/rubidokezive/lazarillo_de_tormes_tratado_7_resumen_para_nios.pdf
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111ad.bin
e25b2fd85518cf406bc3c603f22078f626eb6e4ffb12264160367d7990a95b65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111AD 4940 bytes
font_01_sfnt_off00012274.bin
6cac771d7b9616bd27f23e0a77c6e83575d5978617e071613c1e0e057b9f4498		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12274 12492 bytes
font_02_sfnt_off00014b8c.bin
836aad350a880aafee7d9b17c367d514187dd9d2f7615c25c14a098c97d8a199		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B8C 16236 bytes

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