Malicious PDF — malware analysis report

Static analysis result for SHA-256 352f7456fd3b3d54…

MALICIOUS

PDF

75.4 KB Created: 2020-11-25 22:05:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 97a5d2de9b87a9777b8f8efe8c28d21d SHA-1: 91b454c5b37b645428acdf0f4b3aaa55926367e8 SHA-256: 352f7456fd3b3d5430c96572691d152c8a766bcd9cee426bcc89dcba06fb8021
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-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/strik?utm_term=idle+heroes+five+star+heroes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402504/normal_5f9d4a672d048.pdfIn PDF document text
    • https://lukafove.weebly.com/uploads/1/3/4/6/134655473/dezavo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476007/normal_5fa8e6e6e984a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377908/normal_5f9253a6ead84.pdfIn PDF document text
    • https://gejatovuri.weebly.com/uploads/1/3/1/4/131406669/voxodibujufu-gusojowubozalat-jijiruzad-sadovuvu.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/51288f4c-903b-498d-b3f6-67519a2817c5/7240240520.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d48a1e39-c3c3-4492-9eb7-5b2b3fcad7c5/fogil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f906ae1-6408-4217-a05c-5fc6f1af9466/92129798575.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36e86928-9a6d-4002-a096-e7b737f31991/61468234481.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/657d3612-8356-4410-be1e-8ff8efc27a2a/muwep.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/bluff_master_telugu_movie_tamilrockers.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/torino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3d02f36-5993-4f5a-9453-019e5b594302/26012722689.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A0 4992 bytes
SHA-256: 32723b04829e3c397f7b987ee51c1099f5a0632bbb02ab0749119087876f78d1
font_01_sfnt_off0000e995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE995 9904 bytes
SHA-256: 3cd105ec61d891e21dc10183fb6661d0b9943efd276af0ffce4fe65636429b53
font_02_sfnt_off00010baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAF 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073

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