Malicious PDF — malware analysis report

Static analysis result for SHA-256 b86425e31f77a880…

MALICIOUS

PDF

70.1 KB Created: 2020-11-16 15:28:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 2e349356dcddb2d64cdc78501cf0ac78 SHA-1: c6435c96865c2bd6940127cabcdf4dd60310c7a3 SHA-256: b86425e31f77a88005cf726d38f0ccd1d7809167aab6bc7056b288795e52970f
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the presence of a malicious redirector URL suggests an attempt to lure the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/123?utm_term=side+drawing+of+a+cat In PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/jogowezokuvaxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384307/normal_5f94e7b6da9a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446380/normal_5faee53c7c702.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/aea7550f-e94b-449b-a412-0d5a8eec2760/genugaj.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/health_the_basics_11th_edition_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/diagnostico_anemia_ferropriva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8016b6a1-1132-4a28-823f-0cbad3e466c1/xuresafiriruxenewefa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3c4a3c5-b17d-4e8c-8801-ac40568ea2cf/fomamurivixevibujuvinib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bdd988a-151f-4a93-bcc9-1e0eaed8afee/wicked_whims_sex_animations.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/i_attached_the_requested_information.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/lembongan_island_surf_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49867d53-c8a7-47be-aabf-9694fd48c4b9/81220384757.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa38f972-15a5-41f7-b018-550bf523228b/81825801078.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/toreduvogegusa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1940a0b4-1e4d-4d16-a55e-18b9725c54bb/62031666685.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf027476-ecd8-48b0-ae06-8acf095f0cea/63634701647.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_off0000d641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD641 5172 bytes
SHA-256: 64b4a4274cdece823f79ac9eb3cd1a68e25aff16cf7a6cb1d532de2a5c4a75ef
font_01_sfnt_off0000e800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE800 10760 bytes
SHA-256: 8ab146e373ef74f6d75fc7367b6668b01c703d69ab60b8c6b4f3f3af68f1b87d

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