Malicious PDF — malware analysis report

Static analysis result for SHA-256 993fd332b6f5e471…

MALICIOUS

PDF

78.6 KB Created: 2021-03-01 10:12:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: f1f4b2da17e4a8031c6f37ca1476ab70 SHA-1: 013c3cc3ff91f55e21a298fb6bda2a028f0ec2a4 SHA-256: 993fd332b6f5e471dcc8173a28e170a33f32aaf8555a4abac556b7353e5be035
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that directs users to a malicious domain, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to trick the user into visiting a harmful site, potentially leading to further compromise.

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
  • 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://vilenefex.ru/aws?utm_term=guess+brand+logos+level+280 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4506200/normal_60147dcf1f6bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458623/normal_5fd1a5c684122.pdfIn PDF document text
    • http://okstore.info/10078383371m8bku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462681/normal_602f1b348afbb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365553/normal_5fe092482d2d6.pdfIn PDF document text
    • http://optamorem.com/alyosha_the_pot_leo_tolstoyhyxgj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375210/normal_601be1f08a0b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486354/normal_6006949284037.pdfIn PDF document text
    • http://fastnoutservice.ru/how_to_test_power_supply_of_pcb28az.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/gozifep/93984855317.pdfIn PDF document text
    • https://s3.amazonaws.com/borokegujuzero/lozajemapu.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/51743020927.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/clinical_pharmacist_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/bluebells_childminders_hitchin_ofsted_report.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_off0000f4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B1 5692 bytes
SHA-256: a396aabc2cf3f7fb078b604a53914242c192ec84dd88baad293f8b0cf9fb7559
font_01_sfnt_off0001081d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081D 10996 bytes
SHA-256: 446779cf345a79748d0e92337cb8cfc95a4757db5d9e66f92c9b434fbf1011cc

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