Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea35d44c18864721…

MALICIOUS

PDF

73.4 KB Created: 2020-11-23 02:51:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1db557e4d5c5107dd6a0229ccf84e21e SHA-1: 2385ae96c306ea8eb672799033ea61897fe688f4 SHA-256: ea35d44c18864721b336d9ece895a7745aad66c57793fa11d46b3fdc8450d454
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://traffnew.ru/123?utm_term=governor+mifflin+high+school+shillington+pa PDF link annotation
    • https://botekajerojaj.weebly.com/uploads/1/3/4/7/134749353/zefizuwo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460723/normal_5fae55e8c167a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416316/normal_5fb50c3512888.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366337/normal_5f90f79db07ea.pdfIn PDF document text
    • https://mufuxavezefajox.weebly.com/uploads/1/3/4/4/134497947/diboximide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426955/normal_5fb5c10543311.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449630/normal_5fb8a0de34458.pdfIn PDF document text
    • https://kukezedom.weebly.com/uploads/1/3/4/6/134629177/6132966.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369765/normal_5f8a5b89576f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383137/normal_5f959ad7a48b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452607/normal_5fab91d9b8626.pdfIn PDF document text
    • https://pebewaviwukak.weebly.com/uploads/1/3/4/4/134463457/mepemusixuli-suxamisok-mogonax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366402/normal_5fb7deab56946.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://uploads.strikinglycdn.com/files/2cbf2541-15d0-48e7-8ee3-f0102cbff31e/vocabulary_lesson_13_answers.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_off0000bbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD3 5308 bytes
SHA-256: 1957636ce4bd36d774c9e8d3fe94a76a1e320d9f5e4ff20585fc324fb1ecff80
font_01_sfnt_off0000cdba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBA 11576 bytes
SHA-256: b5511bb8207408cecc9bf0d25ccc8067329d41051248460864ec8841e42ec2d1
font_02_sfnt_off0000f4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BB 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449
font_03_sfnt_off000109ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EA 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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