Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebd8383782956901…

MALICIOUS

PDF

83.3 KB Created: 2020-11-12 20:15:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 884a1c3b41aa4200e55b29808505d911 SHA-1: a49f655ef2cf7b592714f66c473f3b95a3a7d5c9 SHA-256: ebd8383782956901e428b49ecdb0fbb8609421404b49f3d58038e71d0f79122f
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating it is part of a link farm, directing users to external URLs. One such URL, 'https://traffset.ru/aws?utm_term=math+problems+for+1st+graders+worksheets', is embedded within the document's content, disguised as educational material. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing or trojan variant, suggesting a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://traffset.ru/aws?utm_term=math+problems+for+1st+graders+worksheets PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413851/normal_5f9ac6dfa8072.pdfIn PDF document text
    • https://jinonapipi.weebly.com/uploads/1/3/4/4/134481743/9238375.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/05353e16-aa85-43e5-8886-818c191e87a8/gafokosipowex.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/yucca_loma_elementary_school_hours.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/23034368437.pdfIn PDF document text
    • https://s3.amazonaws.com/jaburirarov/remorhaz_d_and_d.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/leave_application_for_job.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76cb95bf-332a-43c3-8f6f-7e8d5b2cba7e/25931807881.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31118f0c-c148-4d24-8573-4b9f8b3cf8ae/jatikatonisizetamexedav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/665c84da-8526-4d3b-8168-2e53ccf7d415/33084379743.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a047f81a-4dfd-4ef4-95f8-66749ea34190/immediate_resignation_letter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/258bae4a-b409-4c57-a205-a76d52f4b3ca/16337080687.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a12014cb-f466-4570-847e-97305b3f0658/manido.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36F 5808 bytes
SHA-256: 7c0284107f7c021614eb296d114008e366d54ee81e310195c5716aa874c36306
font_01_sfnt_off0000f725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF725 10848 bytes
SHA-256: b7df78528369165058e819172a2f9ce247a9a057e9fe0f747d8a34cc49421b85
font_02_sfnt_off00011c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4C 21200 bytes
SHA-256: 6a5b4f88360d8b355603d8330cb8a9023eba1ef09b0ea0ac11b9ea3a0f382bee

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