Malicious PDF — malware analysis report

Static analysis result for SHA-256 59947e7f8197c38e…

MALICIOUS

PDF

79.3 KB Created: 2021-06-04 09:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f20b45455ee6094d4458305e266f7e01 SHA-1: b81506a5e57b8db4a4a25d60e0ea0f493e5c1f31 SHA-256: 59947e7f8197c38eccd36fa8176f6c305f806c4af44ba0457bd07d32194ee466
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://coretry.ru/pbw?utm_term=free+robux+no+human+verification+2018+or+survey PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424024/normal_6035166e8b82d.pdfIn PDF document text
    • https://fikozipe.weebly.com/uploads/1/3/4/8/134887908/303879.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380084/normal_5ff1caf431e92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387590/normal_5ffe7d5440a24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368955/normal_6019483166f67.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423136/normal_5fdeaebc42754.pdfIn PDF document text
    • https://juladugalevatib.weebly.com/uploads/1/3/4/3/134385664/gopifabikaf.pdfIn PDF document text
    • https://bodupojuribun.weebly.com/uploads/1/3/4/7/134758420/vapifopujixawopi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376086/normal_605830c5a17c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420927/normal_6056a7ac42e91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380384/normal_60b95cb723aa2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406191/normal_5fdb9208ee0f3.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4473637/normal_60b52ad645f4e.pdfIn PDF document text
    • https://finikepimu.weebly.com/uploads/1/3/4/0/134017618/5718491.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuxikadafi.pbworks.com/f/61012733793.pdfIn PDF document text
    • http://fotikeralo.pbworks.com/w/file/fetch/144601251/pekixosakofurub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f858fb7-766c-4ce8-bf97-001042ddb91c/nazuratotubej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b74cb55e-dada-4188-ac38-0e584fa612fa/how_much_is_mercedes_maintenance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3347f9eb-76c1-4ffb-8dc5-10e94cfb13ca/xorokiwofag.pdfIn PDF document text
    • http://zalonuzojeru.pbworks.com/f/xuwunilumaparimudi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db778712-b3b8-422c-9dac-9e6001880e9f/dfs_cdma_tool_v_14.9_4.0_crack.pdfIn PDF document text
    • http://bawamotijeku.pbworks.com/w/file/fetch/144600483/did_doraemon_left_nobita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a885175-8530-4590-a38f-f092732d25f6/65580929958.pdfIn PDF document text
    • http://funuvutidip.pbworks.com/w/file/fetch/144467937/2.5_worksheet_iqr_outliers_answers_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef7444ff-9e73-4da3-8d7c-d85cd3578064/51906577439.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_off0000f5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B2 5932 bytes
SHA-256: 6a166bcaa1b60cc8f3c01587f2e707f60f341b52724cfc9e88aa1d32cadb4a98
font_01_sfnt_off000109d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D2 11180 bytes
SHA-256: 647d09636548661bb83dc87d8b239843d4e1fd3f6dbfb6bf63f97a27ca8a4eed