Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ecc95e0c49584a2…

MALICIOUS

PDF

70.7 KB Created: 2020-11-14 04:47:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 6152b376de3df525612d0413e0d4ae53 SHA-1: eb62785adb391784559757a5ac1279b7e23e34e9 SHA-256: 4ecc95e0c49584a219f5f5f5c963cd12391cbe49e186dadfcaa00bd767c19049
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 0.9997

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://traffset.ru/123?utm_term=american+softball+association+rules PDF link annotation
    • https://dadixuva.weebly.com/uploads/1/3/4/0/134018012/natakogowul.pdfIn PDF document text
    • https://kiseridebajesa.weebly.com/uploads/1/3/1/4/131408791/5097077.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/e059771d-7570-4824-b34f-dc5eb133e0c2/beat_street_soundtrack_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/research_essay_outline_template.pdfIn PDF document text
    • https://s3.amazonaws.com/bunobu/acrobat_editor_filehippo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c625f018-e545-4b09-8410-39e71488469f/monsters_inc_mr_waternoose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/749246e8-a198-45ea-8aa0-f90d8e7916fa/desarrollo_humano_diane_papalia_12_edicion.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/celtx_storyboard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b8834a2-5046-418a-b839-3b91f176c315/apwh_dbq_rubric.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/nursing_theory_of_interpersonal_relationship.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/ielts_general_writing_task_1_topics_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93cfc6d9-4b28-4f6c-aec5-086775c39aa7/netgear_nighthawk_ac3200.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_off0000d8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BA 5156 bytes
SHA-256: 569a18db06375c944fda3287e6034483762db806fc8b1845993e981c6cbdc459
font_01_sfnt_off0000ea2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2D 10568 bytes
SHA-256: c1679ae91569cd421e31fb6a70eb7f92c35d4da9a053c020f95cdfe89f4ace39

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