Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cfa5fd59b78be6e…

MALICIOUS

PDF

67.6 KB Created: 2021-06-09 03:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f62f37e0c43e7c3ee4628f5f044e0d23 SHA-1: b3f891b8ef3f2d76f59973d50dc846104fecd4e3 SHA-256: 7cfa5fd59b78be6ee4179a57ded27d5b028438e28090729a7c95b8b25e0f5891
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://ketchas.ru/pbw?utm_term=double+consonant+worksheets PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422144/normal_5fe6ea679e9a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375525/normal_60bec52a2a58b.pdfIn PDF document text
    • https://vabemeraronoj.weebly.com/uploads/1/3/1/4/131452983/14f6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457582/normal_5fd7d7dda6cb9.pdfIn PDF document text
    • https://semulojera.weebly.com/uploads/1/3/2/6/132695334/loderume.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407795/normal_6041728b45207.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413011/normal_60bace044b6b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410020/normal_5fd63cf502e1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393356/normal_600e34a5d55f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474169/normal_605af2312c7d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467589/normal_6052dcf2424ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366359/normal_604d3901bf2de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365636/normal_603bf195ab98a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/970892c3-ed71-4f71-b663-07969116909e/how_to_write_application_letter_for_employment_as_a_teacher.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42f2936b-3465-4864-9b18-35661d866b5e/what_is_definition_of_sustainable_development.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7335aaf-0f1a-4520-83b6-82ec7ab5e322/begobabusosox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/696a50fa-19fb-4c00-a834-a55311047c33/what_are_the_3_important_components_of_a_successful_curriculum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc3bbd96-e968-4fa2-aa6a-7ff95ebd7432/kindle_paperwhite_instructions_for_seniors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/596fbda1-0184-4da2-8416-bf8166b22ba2/835287547.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e95fa4d4-1a81-4699-b805-7b1d754502c1/differentiate_between_viral_and_bacterial_fever.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC48 5180 bytes
SHA-256: eb269ff146b8d947b48695465827f4cf939f30331656c219a859422aba89c15e
font_01_sfnt_off0000ddf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF9 10424 bytes
SHA-256: 56b489ff471e2bd6f157a2c1afefde63621ac48f687fbf953d2f5bcd8072d942

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