Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3f720d6cb86c2a…

MALICIOUS

PDF

90.2 KB Created: 2021-03-28 17:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9587323cd6f4268e8bee11d28b5e5568 SHA-1: 49a4e224d8ea0ae7d0151ea7813e3faa656c1962 SHA-256: ca3f720d6cb86c2a06b7e3c86c1d2c0383218d69215032ee3a8632f772818bbf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified as a link farm. This is a common technique used to direct users to malicious websites for phishing or to distribute further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://nipisod.ru/wix?keyword=berserker+guide+tera PDF link annotation
    • https://mepuralomelefaz.weebly.com/uploads/1/3/4/4/134494325/7829836.pdfIn PDF document text
    • https://nuvawusop.weebly.com/uploads/1/3/5/3/135302159/kujema.pdfIn PDF document text
    • http://delozofize.scienceontheweb.net/bsc_agriculture_1st_year_syllabus_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367313/normal_601bdf8062b2c.pdfIn PDF document text
    • http://ginupedarokuxu.getenjoyment.net/9808452264.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478932/normal_601229ca709af.pdfIn PDF document text
    • https://bikigevoxepasi.weebly.com/uploads/1/3/4/7/134716722/jorukuxijizid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f4d83bb-6e53-4c4e-b8cc-6bd06093e2ab/loxivokikejikixu.pdfIn PDF document text
    • https://s3.amazonaws.com/zowibatev/nikeguzakowejubinazixo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75744c00-32ac-4ab6-89d1-df20c4adb882/samagokijanisusagi.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/86495109012.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/19301253666.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/67871077997.pdfIn PDF document text
    • http://tizeruxabono.onlinewebshop.net/best_biceps_workout.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d65f36c-ad1c-439e-ab26-2f02ef262915/56902486409.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/551ff26d-e727-4a38-a901-cce8114bbfa0/pezamegu.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/zajepibitibididudu.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/gugarupodurojemisujigo.pdfIn PDF document text
    • http://radiviwix.onlinewebshop.net/how_to_do_a_time_management_workshop.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/86242177267.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/7494303306.pdfIn 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_off0001221f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221F 5076 bytes
SHA-256: 1e550885d8ad4f05ce15fc8729cbf1709f6ed96e949fc3b7815f22f486ac3101
font_01_sfnt_off00013371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13371 11848 bytes
SHA-256: 904e6a9bf3fda2dae72c4d3477e7222048fa2277faae56d086c11b47cf4f9b8d

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