Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd8389c913dfc8fe…

MALICIOUS

PDF

78.8 KB Created: 2020-11-21 06:08:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 9ad1aa1a14ca4014874d1008df24f33f SHA-1: d60fd2c23ec8206db0010fe2711e7f6441724fff SHA-256: dd8389c913dfc8fe80eaac11c6b42ff034f9a25c5b11494ebc53fc438c3c895c
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 0.9996

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://traffset.ru/123?utm_term=triangle+sum+conjecture+worksheet PDF link annotation
    • https://pitamiled.weebly.com/uploads/1/3/4/0/134098016/luborofuz_babenibike.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384142/normal_5f90563b4ae25.pdfIn PDF document text
    • https://jowodetuleguzu.weebly.com/uploads/1/3/1/8/131856173/fudunivulepoxozug.pdfIn PDF document text
    • https://rowurasivove.weebly.com/uploads/1/3/4/3/134357219/todimabidop_rozaxabeb_wovajidora.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387703/normal_5f8df130e4efb.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/sekojawoxaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457876/normal_5fa3332083f00.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/alergia_a_picadura_de_abeja.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/sample_of_apa_abstract_paper_written.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/39070487088.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/xabafataluxobevo.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/lightroom_presets_vsco.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/facebook_ads_report.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21B 5276 bytes
SHA-256: c697f632fcd5ccbffb747e7736f1e7ed03a0e3a2faeb0b62eb37f15f1dc69109
font_01_sfnt_off0000e3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F0 11184 bytes
SHA-256: 01a6af1712ff4dba41ff9658cba3ac3302bfb980410555319b5d5417a7ff4c7c
font_02_sfnt_off00010a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A67 16208 bytes
SHA-256: 1b0cb72d22602438b7e57101475c869d218db2c235f4f8c4774ab6617b658753
font_03_sfnt_off00011fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB6 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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