Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf1de8a44c201a8…

MALICIOUS

PDF

100.6 KB Created: 2021-05-30 20:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 402bdda743da50e529a4b00bcb7f86a3 SHA-1: 60d1154f0d6b25633b8c41b58ead3a39ad4da2cc SHA-256: 7bf1de8a44c201a8f7dc306700192d997c7dd46b17123aefa4ff48af603ca03e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a heuristic firing for a 'PDF_SEO_LINK_FARM' which indicates a large number of external links, with the primary malicious URL being 'https://nipisod.ru/strik?utm_term=widevine+content+decryption+module+%2528google+inc.+%25E6%258F%2590%25E4%25BE%259B%2529'. ClamAV also detected this as 'Pdf.Phishing.Trojan'. The presence of embedded URLs and the overall structure suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8625

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://nipisod.ru/strik?utm_term=widevine+content+decryption+module+%2528google+inc.+%25E6%258F%2590%25E4%25BE%259B%2529 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372960/normal_606466957ad86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449406/normal_60571f03e45d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463810/normal_5fec5a5e7be27.pdfIn PDF document text
    • https://temabodanifow.weebly.com/uploads/1/3/1/4/131454916/6755192.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482403/normal_5fdab61f1cca7.pdfIn PDF document text
    • https://siputewebototab.weebly.com/uploads/1/3/4/4/134480832/8057126.pdfIn PDF document text
    • https://nizomepovunamox.weebly.com/uploads/1/3/4/3/134305669/dc6ae5753013c8.pdfIn PDF document text
    • https://foxanebipukete.weebly.com/uploads/1/3/4/3/134309218/da6a0196.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453551/normal_60243eb237f7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484805/normal_5ffc352b83a39.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483070/normal_5fee817117f84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449178/normal_606a9e9bc81ed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1dc9eb8-f21c-4400-b8e2-ecbad95a7ed8/how_to_put_in_polaroid_film_600.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ee76027-f2ef-4080-a37d-caddb3a8a730/does_costco_do_sodastream_refills.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39577a9a-b670-4462-9ff5-ef93649d57a0/81521430245.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6936d4ac-6720-4897-b450-a94d7181e38f/dazuwuguripuki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57f1a9cf-bb82-4615-94b5-83611f244f60/66532567913.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09ff00c1-c765-4a18-8a62-c6edbe42d093/lomidirifivonusitajenux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdef0ca1-8a32-461d-af9e-c1c31f63cbaa/kugilufa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20f6d652-551a-4454-93f9-db8142b58d43/epson_wf_2530_scanner_driver_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a1f3fdc-4d8b-4f85-b450-1cb0085fed43/midamotinotewa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c9ec424-9d5e-45bd-a5f9-de1c75a4dfbb/the_prisoner_of_chillon_sonnet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dda54ace-c454-4970-9805-3d5ffb467703/aircare_humidifier_cleaning_instructions.pdfIn PDF document text

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