Malicious PDF — malware analysis report

Static analysis result for SHA-256 681f59458a5e4439…

MALICIOUS

PDF

58.9 KB Created: 2020-12-17 00:13:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 0045964ceaaa02e5fba111817f615961 SHA-1: 22004f10fe798132313973b73fcec5293f00feef SHA-256: 681f59458a5e443920016c06e559fa6962cb34847fcbbba770ad8775ea0ffbb0
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious or spam content.

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://traffking.ru/aws?utm_term=possessive+nouns+worksheet+for+grade+2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386081/normal_5f8d86101e43e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445570/normal_5f9dc5851ef16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426085/normal_5fa3e4c259c3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423452/normal_5faf49375fb60.pdfIn PDF document text
    • https://jigulukeduza.weebly.com/uploads/1/3/4/5/134508725/taxuweguno-kuzagajukefupig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388062/normal_5f93d5d53f7e1.pdfIn PDF document text
    • https://kegixofuwo.weebly.com/uploads/1/3/4/5/134577478/detekuzakux_nagasujibopur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486969/normal_5fba3a35e08b1.pdfIn PDF document text
    • https://lelebozo.weebly.com/uploads/1/3/4/5/134578107/8491489.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366047/normal_5f9996a754757.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370542/normal_5f887e7a4e13c.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/daraniwekamidir/primary_school_curriculum_maths_teacher_guidelines.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_off0000abb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABB5 5484 bytes
SHA-256: bfdff369f2d303d15db208a3d198ce772e57b23a42fc01da57ff85fbbd8cc87a
font_01_sfnt_off0000be6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6E 9512 bytes
SHA-256: 3211ccf642c20351072aa4bd33cf9f628ac98eb03ba3173dc56728a69ec2b7db

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