Malicious PDF — malware analysis report

Static analysis result for SHA-256 6423ab29f32531f8…

MALICIOUS

PDF

73.4 KB Created: 2021-03-27 10:01:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5e494ddd117473bdb5825488c62455f4 SHA-1: 1cd27704bfb290d6f5f9e52464f940b4d98d3a2a SHA-256: 6423ab29f32531f8e21e7a55105c3765182d549d1d30df5d2cfe4dd07c178e75
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The document contains a large number of external links, a common tactic for SEO farms or redirecting users to malicious sites. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest potential for embedded JavaScript or other exploit mechanisms.

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
  • 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://zajinet.ru/123?utm_term=boards+and+beyond+slides+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413842/normal_5ff1c51bc750b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371791/normal_6055cfe4566f4.pdfIn PDF document text
    • https://cdn.sqhk.co/gotakavapu/0je7Jhh/83365052144.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373520/normal_605cabd37b570.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414873/normal_600d1b3c44aa0.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/NDOZ9jf/who_is_the_voice_of_the_infographics_show.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/d88fbbb2-938a-4df5-880a-151a34f5b996/nenadoxizege.pdfIn PDF document text
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_3bc2fb50d5544556b8c417cdf65f32a3.pdf?index=trueIn PDF document text
    • https://3cd6846c-369c-4875-9c63-132df726a2dd.filesusr.com/ugd/7ab50f_3a49d57130e84962ad1b18344aa4e7de.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2231920-d14a-4517-bd0f-c4273e9cd803/fl_studio_12_apk_free_download_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/jowurujebapom.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/pedaju.pdfIn PDF document text
    • https://dc383e6d-b7a3-4e67-a88a-227fa542b6c3.filesusr.com/ugd/72b0e7_5777b2a815f84a43a7d1ca8b803ffa28.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/85670379110.pdfIn PDF document text
    • https://s3.amazonaws.com/gagotaniwipure/doxovopabotalapalulebol.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/05_dodge_ram_1500_wheel_bolt_pattern.pdfIn PDF document text
    • https://944456f3-75eb-4cd6-bbfd-656b3713ada1.filesusr.com/ugd/2c8d66_3e45b697832d4b1d9ed8dab2e75c900d.pdf?index=trueIn 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_off0000dfe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE7 5324 bytes
SHA-256: a9cbff650b6e6630d01c453cdd0dc61021bd4fff3b8211aa256f1a30f4058b1c
font_01_sfnt_off0000f211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF211 11320 bytes
SHA-256: e6b79020c7585358f444f9c4e4761e3ac9df323a33f8adb373b4c3b30b497d02

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