Malicious PDF — malware analysis report

Static analysis result for SHA-256 52323b0c34b57a92…

MALICIOUS

PDF

71.0 KB Created: 2020-11-23 13:50:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: e3ecc3fc3a4a258e79b1cb8b92981837 SHA-1: b85b7868b7961dc03dfba3f11ec031a8faa4f6a3 SHA-256: 52323b0c34b57a92d066f82970ea89766a5c6e237954ed1e1cdfd69e52a40a04
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains numerous embedded links, many of which point to redirector infrastructure or link farms hosted on platforms like Weebly. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one URL leads to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of many external links suggests the PDF's primary function is to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/strik?utm_term=intern+translator+love+nikki In PDF document text
    • https://relowuforobelo.weebly.com/uploads/1/3/4/5/134528439/c8066acdbd2f.pdfIn PDF document text
    • https://kirenokasanav.weebly.com/uploads/1/3/4/4/134445236/846536cc1bfb35.pdfIn PDF document text
    • https://murexaxinafol.weebly.com/uploads/1/3/4/4/134456221/lejijo-wuminobe.pdfIn PDF document text
    • https://gokimojesip.weebly.com/uploads/1/3/4/5/134595710/josabexelajewa_nerime.pdfIn PDF document text
    • https://fowuwulavo.weebly.com/uploads/1/3/4/7/134754099/3488737.pdfIn PDF document text
    • https://tenabawik.weebly.com/uploads/1/3/2/7/132710661/nanafomizanonudisu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387430/normal_5f95a71781909.pdfIn PDF document text
    • https://nafarusulewabol.weebly.com/uploads/1/3/4/5/134587722/fekuzedepoxexadizas.pdfIn PDF document text
    • https://widijozitumude.weebly.com/uploads/1/3/4/6/134688085/9289154.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/mafavuzenoliki/directx_11_android.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/organisational_behaviour_and_human_resource_management.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/conduction_convection_radiation_worksheets_7th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/costco_egyptian_cotton_sheets_recall.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_off0000d726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD726 4740 bytes
SHA-256: 29ee57f3021754560121c457af958fe756244f40db570de56f7b48d699e9d370
font_01_sfnt_off0000e756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE756 12684 bytes
SHA-256: eb6f8a1dcc8cf6cfa40ef7871af7bbb1734f34d58287bfe2998269ecf5774d18

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