Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b78b30a25699503…

MALICIOUS

PDF

72.9 KB Created: 2020-12-27 01:42:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d13b0d1776f7210a73732227927e82eb SHA-1: 49d202e391ef28edd43ba037da7deace32bd4235 SHA-256: 5b78b30a25699503553968f66cdc4470dfd2a8296dfadef6ca0c64b96cb97243
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The embedded content, though heavily obfuscated, suggests an attempt to trick the user into visiting a malicious site, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://cctraff.ru/strik?utm_term=zig+zag+stripe+discount In PDF document text
    • https://cdn.sqhk.co/jafipago/FijzghV/american_hot_rod_cast_where_are_they_now.pdfIn PDF document text
    • https://cdn.sqhk.co/simunenij/hjiddZp/94689256963.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405907/normal_5f9b01f6b5c71.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421472/normal_5fcf817c57577.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444875/normal_5fe5536035336.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372104/normal_5fa0547b5b229.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422373/normal_5fce82c797b39.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/311ee9a9-5f63-498d-ab52-5669a18708b3/70579618883.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/72099557302.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c7e6fcb-3723-4604-911e-bb6275a29218/rokeponovopokuzadapane.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7f3a489-7b51-4acd-8d5b-b63369ff80cf/pathophysiology_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebd4aaa8-695b-4bdd-af54-3f986b87ac2d/animal_skulls_for_sale_cheap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c462278a-f9a9-4e07-9354-3ea890214dd4/27120971842.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_off0000df1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1C 5216 bytes
SHA-256: a6cf68147381cefc7dd5f87271b219fd215e8663c60c945297e12a2e281d4c26
font_01_sfnt_off0000f0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F7 11032 bytes
SHA-256: 507bbff7a138798e439c182c797087f18dfe514767295dcaedbd6d0c87ae2fa2

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