Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d57a02d89a7b20…

MALICIOUS

PDF

68.0 KB Created: 2020-12-23 06:15:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e96bd4c0d94ba9ad991c049cfa160e7f SHA-1: 536abf7da870a524ca43b143fcce5e389cd4dd94 SHA-256: d8d57a02d89a7b20d42dbfcd46213abb16d95eeb9f2436dee2f2cd1b0f9ac6ed
156 Risk Score

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-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://traffine.ru/123?utm_term=is+zero+a+positive+rational+number PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365624/normal_5f876036432a6.pdfIn PDF document text
    • https://nimopiwezu.weebly.com/uploads/1/3/4/7/134700470/e21e2c7c2281e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455370/normal_5fd9deda9709b.pdfIn PDF document text
    • https://juzajepilokak.weebly.com/uploads/1/3/4/6/134682244/247f33dbebc03.pdfIn PDF document text
    • https://wevokowuluza.weebly.com/uploads/1/3/4/7/134739861/lekalurigezij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377116/normal_5fa0f0acd5aa0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487665/normal_5fda0721bdbc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369630/normal_5f8f6d54a0abb.pdfIn PDF document text
    • https://zujamabosav.weebly.com/uploads/1/3/4/3/134363941/godabu_pisakagugaxub.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/sevoga/fault_block_mountain_definition_earth_science.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/19430585244.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdd379fff074777c983261b/t/5fddb10a91828d0f5d34d112/1608364309266/vaxusisekeruzofebu.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_off0000cda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA5 5152 bytes
SHA-256: 1a6ce073dad9739b8932d0e22086722e234926754638996b98eff90a269f74a1
font_01_sfnt_off0000df1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1F 10652 bytes
SHA-256: 38042e5ea554bcb62fa44de34865165c2fa31125628aef889094d1721d10fb85