Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4968ac6a4ea54cb…

MALICIOUS

PDF

81.8 KB Created: 2021-05-21 10:34:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8faea47955fa1677847277f053eb41b5 SHA-1: d1d73efc522755c4ef98f5e2825254459ecb2e8f SHA-256: c4968ac6a4ea54cb1aacf02c93e7f9b8f8c154f6304d671c75771d531fd60cd8
96 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The embedded URL points to a suspicious domain, likely serving as a lure for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://mezovuduw.ru/strik?utm_term=steampunk+go+launcher+themes+apk PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4392862/normal_5fdee9ff6d5d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422161/normal_600c942fc57ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413977/normal_600a941cf1a87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390660/normal_6025a4df0e420.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409248/normal_6025eb9431cc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376101/normal_601d162b8d463.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416930/normal_6057066a8f4a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496380/normal_605c2371e1099.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/davolazupivowi/jugopiweniw.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/begomegijat.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/4533278452.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/torujejulegodexugedisimi.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/73324076718.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/41819750184.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdd3c754-593c-4a12-b38a-531f04980f94/what_are_the_ethics_of_stem_cell_research.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9769db4f-8cef-40cf-9992-ac757c716dfb/43599835151.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be393756-a61d-49da-95a0-3785445e09bc/81984763103.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/civil_service_numerical_reasoning_test_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1472387-381c-4d90-9d7a-813aea81c8cf/how_does_ethnicity_affect_identity.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_off0000eafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFE 5516 bytes
SHA-256: fd90f4bf819ea23ba9aa405685f8a4151969744b7a515b4c4ffd8500f3894611
font_01_sfnt_off0000fd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD90 11352 bytes
SHA-256: 0b09ec9c74e2b64cabb2ac0f9246d246d92b80c712b567feaf17d80d70d05f74
font_02_sfnt_off000124ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CA 16164 bytes
SHA-256: 3afbc95f4a2677bf4c8b77bd7df62e4dbeb651db4b5e482cf97b58e472170d58

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