Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfcfdd26754dfe3f…

MALICIOUS

PDF

72.5 KB Created: 2020-11-29 09:00:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3ee5ce746c105e78e76c6e4c874a1773 SHA-1: 95a243687e111b7631393dd8e19c6b15a451be0a SHA-256: dfcfdd26754dfe3fb314b486a88b2b9515e34dc3dba4d18a3a395f33ca6f1a3b
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://traffking.ru/aws?utm_term=bedingte+formatierung+auf+englisch+excel PDF link annotation
    • https://fitetavixanara.weebly.com/uploads/1/3/4/7/134721375/feloxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452374/normal_5f9fff321b9d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366645/normal_5f87e73323947.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/dorulusof/lagu_aaliyah_massaid_ulangi.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/muscular_system_worksheet_middle_school.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/who_says_always_in_harry_potter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bd431b6-b980-43fa-9807-7141641d7b35/diggys_adventure_apkpure.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/instagram_private_viewer_download.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/savojupekixepiwategugis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bec0722d-6934-4e79-a1cd-076c1b352c95/14461726809.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/38960979520.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d0b65b5-4e89-4f34-bd31-0087f78ebb3e/jack_ma_wife_and_family.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/que_son_los_valores_eticos_universales.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/718b4b09-8deb-4b28-a0e0-0df5a2082a76/65447613330.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/cube_roots_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/004c927d-4785-4414-8ef2-48eab9fc7391/pafewedibapopu.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_off0000dd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2F 5552 bytes
SHA-256: 085df24e42e5b1f5a819c84181b9bdfa5914a59ebe245be2406e768295003d26
font_01_sfnt_off0000efef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEF 11132 bytes
SHA-256: 19f73b4811968e1943e238656b7f0f4776d68cf690580fd8eb57bcd134b952f2

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