Malicious PDF — malware analysis report

Static analysis result for SHA-256 776c8ae3778a8c5d…

MALICIOUS

PDF

89.2 KB Created: 2021-03-18 21:54:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1e5b232ae2077793f46623784b6efc74 SHA-1: 2f27de6c2e50a4508453f1e1a344dedf944cbecf SHA-256: 776c8ae3778a8c5dc4d6ee83b4532d6d13954e9d1df14903899f037e85f5ebac
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9997

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://botokaw.ru/strik?utm_term=is+zilla+in+the+monsterverse PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413865/normal_5fd07284f2e5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413835/normal_603f43cd08a65.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421781/normal_5fc7a7ab2ad86.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420767/normal_5ff1d8656b03d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417817/normal_60373cd068f6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385869/normal_60400b885a4fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380209/normal_5fdda098d9bce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379731/normal_5fc7b56bdf5cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379848/normal_6035e28995a23.pdfIn PDF document text
    • http://navaram.online/xijiziwevibegezikenodipwt8m.pdfIn PDF document text
    • http://digozulujatozuj.iblogger.org/dirasosejatobokavisabifes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466175/normal_60139aff2d785.pdfIn PDF document text
    • http://bcpreactiva-enlinea.com/virginia_woolf_orlando_a_biographyvyqug.pdfIn PDF document text
    • http://bodegumuxizobi.22web.org/2019_released_tamil_movies.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jopugobov.rf.gd/18060665610.pdfIn PDF document text
    • http://rerivumisiso.rf.gd/54153280233.pdfIn PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_474af07caac148899b063c7df4ab1e51.pdf?index=trueIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_469a03f6932f4d38900c41166babf4d9.pdf?index=trueIn PDF document text
    • https://2559d30b-64cd-4b4d-aaad-e76a675dde99.filesusr.com/ugd/f5a024_312ca0b967d04abfbb734b4298be5869.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D0 3228 bytes
SHA-256: bf1616cb2c56153ae86e25e9b69c214ab7fd034f426c0fbd097eb43516d34197
font_01_sfnt_off00012062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12062 4972 bytes
SHA-256: f23e1f7d0e289a2913423bedd550c7653f1d2286d7e228826c3c0ef9cd96c881
font_02_sfnt_off00013129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13129 11040 bytes
SHA-256: f1d8aadc3dc9338b17227a128179ca0232280716b03b86c2aacb654a4ecb1809

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