Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e761a5e1b3b428f…

MALICIOUS

PDF

66.5 KB Created: 2021-01-11 11:50:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f67d03837c0f019c8aed43da9842dba1 SHA-1: 35c997076ddd2b88ff97521cb26bdeda33a3eec6 SHA-256: 1e761a5e1b3b428ffa51a97d0fce44ec099bcfd8996659d3550727d04215ad1f
186 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 0.9998

Heuristics 6

  • 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.
  • 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://trafffi.ru/aws?utm_term=lovely+nirman+all+album+song PDF link annotation
    • https://xebikazogede.weebly.com/uploads/1/3/2/7/132740990/tonoditelem.pdfIn PDF document text
    • https://merafapubumuvu.weebly.com/uploads/1/3/4/8/134887465/vurasoxenixas_jepozepaba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367944/normal_5f895523df134.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403428/normal_5fc0b0e8c037c.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/skggBie/56357979564.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378152/normal_5fb8734c24092.pdfIn PDF document text
    • https://kogevinipuban.weebly.com/uploads/1/3/4/5/134514077/e9d11ae69de.pdfIn PDF document text
    • https://sifizebutu.weebly.com/uploads/1/3/0/8/130814914/3aaa090.pdfIn PDF document text
    • https://zuxufigosod.weebly.com/uploads/1/3/4/3/134309968/wekomapava.pdfIn PDF document text
    • https://lurevovikofa.weebly.com/uploads/1/3/4/6/134693735/6985729.pdfIn PDF document text
    • https://cdn.sqhk.co/ludafojebi/RYOu5R2/2575877920.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473419/normal_5feda0358bd9d.pdfIn PDF document text
    • https://ruzunaxatan.weebly.com/uploads/1/3/4/3/134340268/1769914.pdfIn PDF document text
    • https://runumoviw.weebly.com/uploads/1/3/4/8/134854062/dewevosakonud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/indian_civil_law.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/dowokavozelijafuvediris.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_off0000c6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D6 5248 bytes
SHA-256: b91be9d7684c0aadf6adc1bafb5ab749c07a9cf9cc19e0b56f5d1326c23e592c
font_01_sfnt_off0000d8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A5 10260 bytes
SHA-256: f39c6a66fd23cb84d2dee73f7c585b80021a5de2a2d676eb4d0771f7e6f3c947

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