Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bc98e1f62837898…

MALICIOUS

PDF

72.4 KB Created: 2020-11-25 04:49:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a65606cee989f2fe10043c54ee6ac437 SHA-1: 901baa5c8dc1ff29187314b5ef35cf435972290f SHA-256: 1bc98e1f628378982c4632e8652c3f026c65e02430aa53511fb8d5c091098152
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-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=student+exploration+chemical+equations+answer+key+activity+a PDF link annotation
    • https://giginepa.weebly.com/uploads/1/3/4/3/134389182/venilixoxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416806/normal_5fa1c97a86a42.pdfIn PDF document text
    • https://mirezavofuju.weebly.com/uploads/1/3/4/8/134870541/xuxugela.pdfIn PDF document text
    • https://dojilosadokadog.weebly.com/uploads/1/3/4/8/134890500/402c6bf3b95d19.pdfIn PDF document text
    • https://dawemewi.weebly.com/uploads/1/3/4/7/134747996/3387618.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366365/normal_5f96707bf0fa4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472182/normal_5fb43ce787220.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423166/normal_5fad2aada4568.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/gumegulaxi/basking_ridge_nj_restaurant_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cc4dea3-b3f0-4b78-804c-ba8ee1d27552/77725305744.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/adjectives_examples_sentences.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/93795512962.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/telemecanique_catalogo_pulsanti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a87f46ea-35be-4303-b26d-47750a9a36aa/l_lgance_du_hrisson_rsum.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_off0000c53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC53B 6744 bytes
SHA-256: 1457f465f92dce5d721ee937ece6aadb9c20fed8052b6e38490c72f68f029fdc
font_01_sfnt_off0000dc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC46 5928 bytes
SHA-256: 4294b66237f208a9e1887e9364bf9aaf5141366b7539d2945f859b8b061bfad2
font_02_sfnt_off0000f05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05F 10668 bytes
SHA-256: c945995810eaf0bd0fc410b13f1ae1e700f8baa5b8635c1b312fbf5f80aaab65

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