Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec6ebbbe32f24ba7…

MALICIOUS

PDF

74.9 KB Created: 2021-05-07 20:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 894f3b84936681e5b68bd6880a8b4758 SHA-1: a3f25dbd5d87d9940b639fe628895185e0c35cbb SHA-256: ec6ebbbe32f24ba703921e3bf5f5cd9d64dcd688017dcda15123398e6b5e38eb
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's part of a link farm designed to distribute PDFs. The embedded URLs, particularly the one on 'seumenha.ru', suggest a phishing or malware distribution attempt disguised as educational content. No scripts were extracted, but the PDF structure and numerous external links point towards a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/strik?utm_term=spanish+lessons+for+beginners+pdf
    • http://mscgis.net/cad_software_free_for_windows_xpgl7rb.pdf
    • http://brosbass.com/juvidarosuzetowir7hlqr.pdf
    • http://pifumufupes.iblogger.org/cecily_smith_sheet_music.pdf
    • http://keepmaxi.space/lexus_is300_2jzgte_swap_automaticbhhht.pdf
    • https://ferateritilew.weebly.com/uploads/1/3/4/2/134265971/8125698.pdf
    • http://bovefupemog.iblogger.org/zhuyin_chart.pdf
    • https://radotarurejatu.weebly.com/uploads/1/3/1/6/131607565/fulevagapov_teneluxup_dufugewefaj_tiwenosa.pdf
    • http://ig-copyrightnoticehelp.com/86310109040g5hqy.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://52a72965-a6d2-471e-b66a-59a59a4d663b.filesusr.com/ugd/e643da_5a71366466c1422bad0e2f50d19a7e16.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2352e8bb-ce40-4f02-a08e-107c217ab900/titanic_script_book.pdf
    • https://uploads.strikinglycdn.com/files/3323c1dd-80ca-43e1-90c3-80dd66f08a0e/12283886826.pdf
    • https://uploads.strikinglycdn.com/files/0a646674-95a5-40a9-9898-b4eef1bc92b0/92484095583.pdf
    • https://uploads.strikinglycdn.com/files/d33f3cc8-e6c0-4f55-8e50-a90706c05859/2093492078.pdf
    • https://uploads.strikinglycdn.com/files/7e2e6dc1-1595-4ed7-aaff-176205f4d625/28645646794.pdf
    • https://3a0d5408-2ea1-4258-8d29-5d96341cad2c.filesusr.com/ugd/79cb75_04e427808711486284c2f18b262781d0.pdf?index=true
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_80c0c3323c884f2392d3ddffe2645b9f.pdf?index=true
    • https://22fea36a-5e19-4af1-b4aa-fe6e1efe0ee9.filesusr.com/ugd/b5a188_e24bc5b0310e432ab48d1b208ec41f60.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6b0c02e9-858d-45a2-8fb3-ad644c5fc4ac/61677397316.pdf
    • https://uploads.strikinglycdn.com/files/3ad764a6-4f08-4d98-8360-5aebceaec4a9/9750909842.pdf
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_ca30f20c72c54070a1141d5aa823ee00.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b8d02628-a8ef-4ba9-95a3-2752d9d4c7df/texofikogapidewul.pdf
    • https://uploads.strikinglycdn.com/files/89bfd86a-0298-41a5-a00d-63868d2758b8/warrior_cats_film_trailer_deutsch.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e70a.bin
7a18c62eb66eaa087c6bd3986dc7403a3d52b57ba9ec260a8bb82a8189fff8cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE70A 5548 bytes
font_01_sfnt_off0000f9db.bin
2e33ae04f413857551656808e9fd3746111bf06f87e86203ea7fbfc27896aca8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DB 10624 bytes

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