Malicious PDF — malware analysis report

Static analysis result for SHA-256 1def62928e85e09b…

MALICIOUS

PDF

70.9 KB Created: 2020-11-16 13:02:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 659fffad1abebec7fa27c0dea45b05cd SHA-1: 2bf8ec5213999726d98c4c58f4160e4bde08bc09 SHA-256: 1def62928e85e09b3843fbfbc48b604d3780ed96f5a9728d1530786f47e36eec
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 0.9998

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://trafftec.ru/strik?utm_term=que+es+nutricion+autotrofa PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368471/normal_5faadec4bf5e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369788/normal_5f890e8421516.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385434/normal_5f8fe7c21053b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418013/normal_5f99ced17417e.pdfIn PDF document text
    • https://sogovowezop.weebly.com/uploads/1/3/4/3/134324678/9765094.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385634/normal_5fa12b879819a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385612/normal_5f8fef4d14f68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381531/normal_5f9e2f761b628.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460970/normal_5fabb32cb2056.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368758/normal_5f98094bdd489.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/nowokil/boyle_s_law_problems_worksheet_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/lc_70le650u_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/55755957392.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/google_forms_tutorial_italiano.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEE 4788 bytes
SHA-256: f4829199e459f2a0cf3bff80e71f27f053b152f7127604f637ca775a9f0d35fc
font_01_sfnt_off0000db3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3F 11100 bytes
SHA-256: 1a3447d9acead48a5916409cd3f69459a3009baa82ec7ec80b8ec691a26a23fd
font_02_sfnt_off0000ff4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4B 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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